In this task, you are given a context, a subject, a relation, and many options. Based on the context, from the options select the object entity that has the given relation with the subject. Answer with text (not indexes).

Example Input: Context: Bezirk Mürzzuschlag is a former district of the state of Styria in Austria. Mürzzuschlag merged with the district of Bruck an der Mur to form the new district Bruck-Mürzzuschlag on January 1, 2013., In rail transport, track gauge is the spacing of the rails on a railway track and is measured between the inner faces of the load-bearing rails., The standard gauge (also Stephenson gauge after George Stephenson, International gauge, or normal gauge) is a widely used railway track gauge. Approximately 55% of the lines in the world are this gauge. All high-speed rail lines (except those in Russia, Uzbekistan, and Finland) are standard gauge. The distance between the inside edges of the rails is defined to be (except in the United States, where it is still defined in Imperial and US customary units as ). It is also called the UIC gauge or UIC track gauge, the European gauge in the EU and Russia, or uniform gauge in Queensland, Australia., The Semmering railway ( German : Semmeringbahn ) in Austria , which starts at Gloggnitz and leads over the Semmering to Mürzzuschlag was the first mountain railway in Europe built with a standard gauge track . It is commonly referred to as the world 's first true mountain railway , given the very difficult terrain and the considerable altitude difference that was mastered during its construction . It is still fully functional as a part of the Southern Railway which is operated by the Austrian Federal Railways ., Gloggnitz is a mountain town in the Neunkirchen district of Lower Austria, Austria., The Austrian Federal Railways (German: Österreichische Bundesbahnen or ÖBB, formerly the Bundesbahn Österreich or BBÖ) is the national railway system of Austria, and the administrator of Liechtenstein's railways. The ÖBB group is owned entirely by the Republic of Austria and is divided into several separate businesses that manage the infrastructure and operate passenger and freight services., A ski resort is a resort developed for skiing, snowboarding, and other winter sports. In Europe, most ski resorts are towns or villages in or adjacent to a ski area  a mountainous area with pistes, ski trails and a ski lift system. In North America, it is more common for ski areas to exist well away from towns, so ski resorts usually are destination resorts, often purpose-built and self-contained, where skiing is the main activity., Mürzzuschlag is a town in northeastern Styria, Austria, the capital of the former Mürzzuschlag District. It is located on the Mürz river near the Semmering Pass, the border with the state of Lower Austria, about southwest of Vienna. The population is. Originally an industrial area, the nearby mountains are today a popular ski resort., George Stephenson (9 June 1781  12 August 1848) was an English civil engineer and mechanical engineer who built the first public inter-city railway line in the world to use steam locomotives, the Liverpool and Manchester Railway which opened in 1830. Renowned as the "Father of Railways", the Victorians considered him a great example of diligent application and thirst for improvement, with self-help advocate Samuel Smiles particularly praising his achievements. His rail gauge of , sometimes called "Stephenson gauge", is the standard gauge by name and by convention for most of the world's railways., The Mürz is a river in Austria. It begins north of the Schneealpe in Lower Austria, flows into Styria, and meets the Mur River after 98 km in Bruck an der Mur. Its headwaters end at Mürzzuschlag. Along its course are the tracks of the Southern Railway as well as the Semmering Highway., Lower Austria (; ) is the northeasternmost state of the nine states in Austria. The capital of Lower Austria since 1986 is Sankt Pölten, the most recently designated capital town in Austria. The capital of Lower Austria had formerly been Vienna, even though Vienna has not officially been part of Lower Austria since 1921. With a land area of and a population of 1.612 million people, it is the largest state in Austria, and in terms of population second only to the federal state of Vienna., Styria (, Slovene/) is a state or "Bundesland", located in the southeast of Austria. In area it is the second largest of the nine Austrian federated states, covering . It borders Slovenia and the Austrian states of Upper Austria, Lower Austria, Salzburg, Burgenland, and Carinthia. The population (as of ) was . The capital city is Graz which had 276,526 inhabitants at the beginning of 2015., Liechtenstein , officially the Principality of Liechtenstein, is a doubly landlocked German-speaking microstate in Central Europe. It is a constitutional monarchy with the rank of principality, headed by the Prince of Liechtenstein., Ö, or ö, is a character that represents either a letter from several extended Latin alphabets, or the letter O modified with an umlaut mark or diaeresis. In many languages, the letter ö, or the O modified with what is known as an "umlaut mark", is used to denote the non-close front rounded vowels or . In languages without such vowels, the character is known as an "O with diaeresis" and denotes a syllable break, wherein its pronunciation remains an unmodified ., High-speed rail is a type of rail transport that operates significantly faster than traditional rail traffic, using an integrated system of specialized rolling stock and dedicated tracks. While there is no single standard that applies worldwide, new lines in excess of and existing lines in excess of are widely considered to be high-speed, with some extending the definition to include lower speeds in areas for which these speeds still represent significant improvements. The first such system began operations in Japan in 1964 and was widely known as the bullet train. High-speed trains normally operate on standard gauge tracks of continuously welded rail on grade-separated right-of-way that incorporates a large turning radius in its design., "For the town of the same name, see Semmering, Austria.", Vienna is the capital and largest city of Austria and one of the nine states of Austria. Vienna is Austria's primary city, with a population of about 1.8 million (2.6 million within the metropolitan area, nearly one third of Austria's population), and its cultural, economic, and political centre. It is the 7th-largest city by population within city limits in the European Union. Until the beginning of the 20th century, it was the largest German-speaking city in the world, and before the splitting of the Austro-Hungarian Empire in World War I, the city had 2 million inhabitants. Today, it has the second largest number of German speakers after Berlin. Vienna is host to many major international organizations, including the United Nations and OPEC. The city is located in the eastern part of Austria and is close to the borders of the Czech Republic, Slovakia, and Hungary. These regions work together in a European Centrope border region. Along with nearby Bratislava, Vienna forms a metropolitan region with 3 million inhabitants. In 2001, the city centre was designated a UNESCO World Heritage Site., Subject: semmering railway, Relation: instance_of, Options: (A) 12 (B) administrator (C) application (D) area (E) august (F) bearing (G) berlin (H) bezirk (I) border (J) capital (K) character (L) city (M) city centre (N) constitutional monarchy (O) course (P) definition (Q) distance (R) district (S) grade (T) hungary (U) infrastructure (V) june (W) letter (X) line (Y) mountain (Z) name ([) nine (\) number (]) people (^) population (_) principality (`) railway line (a) railway system (b) rank (c) river (d) rolling stock (e) ski resort (f) skiing (g) standard (h) state (i) syllable (j) system (k) town (l) track (m) transport (n) work (o) world heritage site (p) world war
Example Output: railway line

Example Input: Context: Rheumatoid arthritis (RA) is a long-term autoimmune disorder that primarily affects joints. It typically results in warm, swollen, and painful joints. Pain and stiffness often worsen following rest. Most commonly, the wrist and hands are involved, with the same joints typically involved on both sides of the body. The disease may also affect other parts of the body. This may result in a low red blood cell count, inflammation around the lungs, and inflammation around the heart. Fever and low energy may also be present. Often, symptoms come on gradually over weeks to months.
While the cause of rheumatoid arthritis is not clear, it is believed to involve a combination of genetic and environmental factors. The underlying mechanism involves the body's immune system attacking the joints. This results in inflammation and thickening of the joint capsule. It also affects the underlying bone and cartilage. The diagnosis is made mostly on the basis of a person's signs and symptoms. X-rays and laboratory testing may support a diagnosis or exclude other diseases with similar symptoms. Other diseases that may present similarly include systemic lupus erythematosus, psoriatic arthritis, and fibromyalgia among others.
The goal of treatment is to reduce pain, decrease inflammation, and improve a person's overall functioning. This may be helped by balancing rest and exercise, the use of splints and braces, or the use of assistive devices. Pain medications, steroids, and NSAIDs are frequently used to help with symptoms. A group of medications called disease-modifying antirheumatic drugs (DMARDs), such as hydroxychloroquine and methotrexate, may be used to try to slow the progression of disease. Biological DMARDs may be used when disease does not respond to other treatments. However, they may have a greater rate of adverse effects. Surgery to repair, replace, or fuse joints may help in certain situations. Most alternative medicine treatments are not supported by evidence.
RA affects between 0.5 and 1% of adults in the developed world with between 5 and 50 per 100,000 people newly developing the condition each year. Onset is most frequent during middle age and women are affected 2.5 times as frequently as men. In 2013, it resulted in 38,000 deaths up from 28,000 deaths in 1990. The first recognized description of RA was made in 1800 by Dr. Augustin Jacob Landré-Beauvais (17721840) of Paris. The term "rheumatoid arthritis" is based on the Greek for watery and inflamed joints.
Signs and symptoms.
RA primarily affects joints, but it also affects other organs in more than 1525% of individuals., Fibromyalgia (FM) is a medical condition characterised by chronic widespread pain and a heightened pain response to pressure. Other symptoms include feeling tired to a degree that normal activities are affected, sleep problems, and troubles with memory. Some people also report restless legs syndrome, bowel or bladder problems, numbness and tingling, and sensitivity to noise, lights or temperature. Fibromyalgia is frequently associated with depression, anxiety, and posttraumatic stress disorder. Other types of chronic pain are also frequently present.
The cause of fibromyalgia is unknown; however, it is believed to involve a combination of genetic and environmental factors with half the risk attributed to each. The condition runs in families and many genes are believed to be involved. Environmental factors may include psychological stress, trauma, and certain infections. The pain appears to result from processes in the central nervous system and the condition is referred to as a "central sensitization syndrome". Fibromyalgia is recognized as a disorder by the US National Institutes of Health and the American College of Rheumatology. There is no specific diagnostic test. Diagnosis involves first ruling out other potential causes and verifying that a set number of symptoms are present.
The treatment of fibromyalgia can be difficult. Recommendations often include getting enough sleep, exercising regularly, and eating a healthy diet. Cognitive behavioral therapy may also be helpful. The medications duloxetine, milnacipran, or pregabalin may be used. Use of opioid pain medication is controversial with some stating their use is poorly supported by evidence and others saying that weak opioids may be reasonable if other medications are not effective. Dietary supplements also lack evidence to support their use. While fibromyalgia can last a long time, it does not result in death or tissue damage.
Fibromyalgia is estimated to affect 28% of the population. Females are affected about twice as often as males. Rates appear similar in different areas of the world and among different cultures. Fibromyalgia was first defined in 1990 with updated criteria in 2011. There is controversy about the classification, diagnosis, and treatment of fibromyalgia. While some feel the diagnosis of fibromyalgia may negatively affect a person, other research finds it to be beneficial. The term "fibromyalgia" is from New Latin, "fibro-", meaning "fibrous tissues", Greek  "myo-", "muscle", and Greek  "algos", "pain"; thus the term literally means "muscle and fibrous connective tissue pain"., A burn is a type of injury to skin, or other tissues, caused by heat, cold, electricity, chemicals, friction, or radiation. Most burns are due to heat from hot liquids, solids, or fire. Females in many areas of the world have a higher risk related to the more frequent use of open cooking fires or unsafe cook stoves. Alcoholism and smoking are other risk factors. Burns can also occur as a result of self harm or violence between people.
Burns that affect only the superficial skin layers are known as superficial or first-degree burns. They appear red without blisters and pain typically lasts around three days. When the injury extends into some of the underlying skin layer, it is a partial-thickness or second-degree burn. Blisters are frequently present and they are often very painful. Healing can require up to eight weeks and scarring may occur. In a full-thickness or third-degree burn, the injury extends to all layers of the skin. Often there is no pain and the burn area is stiff. Healing typically does not occur on its own. A fourth-degree burn additionally involves injury to deeper tissues, such as muscle, tendons, or bone. The burn is often black and frequently leads to loss of the burned part.
Burns are generally preventable. Treatment depends on the severity of the burn. Superficial burns may be managed with little more than simple pain medication, while major burns may require prolonged treatment in specialized burn centers. Cooling with tap water may help pain and decrease damage; however, prolonged cooling may result in low body temperature. Partial-thickness burns may require cleaning with soap and water, followed by dressings. It is not clear how to manage blisters, but it is probably reasonable to leave them intact if small and drain them if large. Full-thickness burns usually require surgical treatments, such as skin grafting. Extensive burns often require large amounts of intravenous fluid, due to capillary fluid leakage and tissue swelling. The most common complications of burns involve infection. Tetanus toxoid should be given if not up to date.
In 2013, fire and heat resulted in 35 million injuries. This resulted in about 2.9 million hospitalizations and 238,000 dying. Most deaths due to burns occur in the developing world, particularly in Southeast Asia. While large burns can be fatal, treatments developed since 1960 have improved outcomes, especially in children and young adults. In the United States, approximately 96% of those admitted to a burn center survive their injuries. Burns occur at similar frequencies in men and women. The long-term outcome is related to the size of burn and the age of the person affected.
Signs and symptoms.
The characteristics of a burn depend upon its depth. Superficial burns cause pain lasting two or three days, followed by peeling of the skin over the next few days. Individuals suffering from more severe burns may indicate discomfort or complain of feeling pressure rather than pain. Full-thickness burns may be entirely insensitive to light touch or puncture. While superficial burns are typically red in color, severe burns may be pink, white or black. Burns around the mouth or singed hair inside the nose may indicate that burns to the airways have occurred, but these findings are not definitive. More worrisome signs include: shortness of breath, hoarseness, and stridor or wheezing. Itchiness is common during the healing process, occurring in up to 90% of adults and nearly all children. Numbness or tingling may persist for a prolonged period of time after an electrical injury. Burns may also produce emotional and psychological distress., Orthopedic surgery or orthopedics (alternatively spelled orthopaedic surgery and orthopaedics) is the branch of surgery concerned with conditions involving the musculoskeletal system. Orthopedic surgeons use both surgical and nonsurgical means to treat musculoskeletal trauma, spine diseases, sports injuries, degenerative diseases, infections, tumors, and congenital disorders.
Etymology.
Nicholas Andry coined the word ""orthopædics"" in French as "orthopédie", derived from the Greek words  "orthos" ("correct", "straight") and  "paidion" ("child"), when he published "Orthopedie" (translated as "Orthopædia: or the Art of Correcting and Preventing Deformities in Children") in 1741. Though as the name implies it was initially developed with attention to children, the correction of spinal and bony deformities in all stages of life eventually became the cornerstone of orthopedic practice., Septic arthritis, also known as infectious arthritis or joint infection, is the purulent invasion of a joint by an infectious agent which produces arthritis. People with artificial joints are more at risk than the general population but have slightly different symptoms, are infected with different organisms and require different treatment. Septic arthritis is considered a medical emergency. If untreated, it may destroy the joint in a period of days. The infection may also spread to other parts of the body., Arthritis is a term often used to mean any disorder that affects joints. Symptoms generally include joint pain and stiffness. Other symptoms may include redness, warmth, swelling, and decreased range of motion of the affected joints. In some types other organs are also affected. Onset can be gradual or sudden.
There are over 100 types of arthritis. The most common forms are osteoarthritis (degenerative joint disease) and rheumatoid arthritis. Osteoarthritis usually occurs with age and affects the fingers, knees, and hips. Rheumatoid arthritis is an autoimmune disorder that often affects the hands and feet. Other types include gout, lupus, fibromyalgia, and septic arthritis. They are all types of rheumatic disease.
Treatment may include resting the joint and alternating between applying ice and heat. Weight loss and exercise may also be useful. Pain medications such as ibuprofen and paracetamol (acetaminophen) may be used. In some a joint replacement may be useful.
Osteoarthritis affects more than 3.8% of people while rheumatoid arthritis affects about 0.24% of people. Gout affects about 1 to 2% of the Western population at some point in their lives. In Australia about 15% of people are affected, while in the United States more than 20% of have a type of arthritis. Overall the disease becomes more common with age. Arthritis is a common reason that people miss work and can result in a decreased quality of life. The term is from Greek "arthro-" meaning joint and "-itis" meaning inflammation., A bone is a rigid organ that constitutes part of the vertebrate skeleton. Bones support and protect the various organs of the body, produce red and white blood cells, store minerals, provide structure and support for the body, and enable mobility. Bones come in a variety of shapes and sizes and have a complex internal and external structure. They are lightweight yet strong and hard, and serve multiple functions. , Pain is a distressing feeling often caused by intense or damaging stimuli, such as stubbing a toe, burning a finger, putting alcohol on a cut, or bumping the "funny bone". Because it is a complex, subjective phenomenon, defining pain has been a challenge. The International Association for the Study of Pain's widely used definition states: "Pain is an unpleasant sensory and emotional experience associated with actual or potential tissue damage, or described in terms of such damage." In medical diagnosis, pain is regarded as a symptom of an underlying condition., A disease is a particular abnormal condition, a disorder of a structure or function, that affects part or all of an organism. The study of disease is called pathology which includes the causal study of etiology. Disease is often construed as a medical condition associated with specific symptoms and signs. It may be caused by external factors such as pathogens, or it may be caused by internal dysfunctions particularly of the immune system such as an immunodeficiency, or a hypersensitivity including allergies and autoimmunity., Replacement arthroplasty (from Greek "arthron", joint, limb, articulate, + "plassein", to form, mould, forge, feign, make an image of), or joint replacement surgery, is a procedure of orthopedic surgery in which an arthritic or dysfunctional joint surface is replaced with an orthopedic prosthesis. Joint replacement is considered as a treatment when severe joint pain or dysfunction is not alleviated by less-invasive therapies. During the latter half of the 20th century, rheumasurgery developed as a subspecialty focused on these and a few other procedures in patients with rheumatic diseases., White blood cells (WBCs), also called leukocytes or leucocytes, are the cells of the immune system that are involved in protecting the body against both infectious disease and foreign invaders. All white blood cells are produced and derived from multipotent cells in the bone marrow known as hematopoietic stem cells. Leukocytes are found throughout the body, including the blood and lymphatic system., Osteoarthritis ( OA ) is a type of joint disease that results from breakdown of joint cartilage and underlying bone . The most common symptoms are joint pain and stiffness . Initially , symptoms may occur only following exercise , but over time may become constant . Other symptoms may include joint swelling , decreased range of motion , and when the back is affected weakness or numbness of the arms and legs . The most commonly involved joints are those near the ends of the fingers , at the base of the thumb , neck , lower back , knees , and hips . Joints on one side of the body are often more affected than those on the other . Usually the problems come on over years . It can affect work and normal daily activities . Unlike other types of arthritis , only the joints are typically affected . Causes include previous joint injury , abnormal joint or limb development , and inherited factors . Risk is greater in those who are overweight , have one leg of a different length , and have jobs that result in high levels of joint stress . Osteoarthritis is believed to be caused by mechanical stress on the joint and low grade inflammatory processes . It develops as cartilage is lost with eventually the underlying bone becoming affected . As pain may make it difficult to exercise , muscle loss may occur . Diagnosis is typically based on signs and symptoms with medical imaging and other tests occasionally used to either support or rule out other problems . Unlike in rheumatoid arthritis , which is primarily an inflammatory condition , the joints do not typically become hot or red . Treatment includes exercise , efforts to decrease joint stress , support groups , and pain medications . Efforts to decrease joint stress include resting and the use of a cane . Weight loss may help in those who are overweight . Pain medications may include paracetamol ( acetaminophen ) . If this does not work NSAIDs such as naproxen may be used , but these medications are associated with greater side effects . Opioids if used are generally only recommended short term due to the risk of addiction . If pain interferes with normal life despite other treatments , joint replacement surgery may help . An artificial joint , however , only lasts a limited amount of time . Outcomes for most people with osteoarthritis are good . OA is the most common form of arthritis with disease of the knee and hip affecting about 3.8 % of people as of 2010 . Among those over 60 years old about 10 % of males and 18 % of females are affected . It is the cause of about 2 % of years lived with disability . In Australia about 1.9 million people are affected , and in the United States about 27 million people are affected . Before 45 years of age it is more common in men , while after 45 years of age it is more common in women . It becomes more common in both sexes as people become older ., Pathology (from the Greek roots of "pathos", meaning "experience" or "suffering", and "-logia", "study of") is a significant component of the causal study of disease and a major field in modern medicine and diagnosis., Medical imaging is the technique and process of creating visual representations of the interior of a body for clinical analysis and medical intervention, as well as visual representation of the function of some organs or tissues (physiology). Medical imaging seeks to reveal internal structures hidden by the skin and bones, as well as to diagnose and treat disease. Medical imaging also establishes a database of normal anatomy and physiology to make it possible to identify abnormalities. Although imaging of removed organs and tissues can be performed for medical reasons, such procedures are usually considered part of pathology instead of medical imaging., Subject: osteoarthritis, Relation: medical_specialty, Options: (A) infection (B) infectious disease (C) orthopedics (D) pathology (E) rheumatology (F) surgery
Example Output: rheumatology

Example Input: Context: The National Observatory of Athens (NOA) is a research institute in Athens, Greece. Founded in 1842, it is the oldest research foundation in Greece, as it was the first scientific research institute built after Greece became independent in 1829, and one of the oldest research institutes in Southern Europe., Aigio, also written as "Aeghion, Aegion, Aegio, Egio", is a town and a former municipality in Achaea, West Greece, Greece. Since the 2011 local government reform it is part of the municipality Aigialeia, of which it is the seat and a municipal unit. The municipal unit has an area of 151.101 km. Its population is around 26,000. Aigio is a port town on the Gulf of Corinth., Erymanthos (Latin: "Erymanthus", also Olonos ()) is a mountain range in the southern part of Achaea and the northeastern part of Elis. With an elevation of 2,224 meters, it is the fourth-tallest mountain in the Peloponnese peninsula. The summit is located on the boundary of Achaea and Elis. Historically, Mount Erymanthos was part of northwestern Arcadia, where it was the second-tallest mountain range. The northern portion belonged to the historic Achaea., Europe is a continent that comprises the westernmost part of Eurasia. Europe is bordered by the Arctic Ocean to the north, the Atlantic Ocean to the west, and the Mediterranean Sea to the south. To the east and southeast, Europe is generally considered as separated from Asia by the watershed divides of the Ural and Caucasus Mountains, the Ural River, the Caspian and Black Seas, and the waterways of the Turkish Straits. Yet the non-oceanic borders of Europea concept dating back to classical antiquityare arbitrary. The primarily physiographic term "continent" as applied to Europe also incorporates cultural and political elements whose discontinuities are not always reflected by the continent's current overland boundaries., Achaea or Achaia, sometimes transliterated from Greek as Akhaïa ("Achaïa"), is one of the regional units of Greece. It is part of the region of West Greece and is situated in the northwestern part of the Peloponnese peninsula. The capital is Patras. Since 2001, the population has exceeded 300,000., Athens ("Athína" ) is the capital and largest city of Greece. Athens dominates the Attica region and is one of the world's oldest cities, with its recorded history spanning over 3,400 years, and its earliest human presence starting somewhere between the 11th and 7th millennia BC. Classical Athens was a powerful city-state that emerged in conjunction with the seagoing development of the port of Piraeus, which had been a distinct city prior to its 5th century BC incorporation with Athens. A centre for the arts, learning and philosophy, home of Plato's Academy and Aristotle's Lyceum, it is widely referred to as the cradle of Western civilization and the birthplace of democracy, largely because of its cultural and political impact on the European continent, and in particular the Romans. In modern times, Athens is a large cosmopolitan metropolis and central to economic, financial, industrial, maritime, political and cultural life in Greece. In 2015, Athens was ranked the world's 29th richest city by purchasing power and the 67th most expensive in a UBS study., Göttingen (; Low German: "Chöttingen") is a university city in Lower Saxony, Germany. It is the capital of the district of Göttingen. The River Leine runs through the town. In 2011 the population was 116,052., Kalavryta is a town and a municipality in the mountainous east-central part of the regional unit of Achaea, Greece. The town is located on the right bank of the river Vouraikos, south of Aigio, southeast of Patras and northwest of Tripoli. Notable mountains in the municipality are Mount Erymanthos in the west and Aroania or Chelmos in the southeast. Kalavryta is the southern terminus of the Diakopto-Kalavryta rack railway, built by Italian engineers between 1885 and 1895., The Vouraikos is a river in Achaea, Greece. In ancient times it was called Erasinos. Its source is in the Aroania mountains, near the village of Priolithos. It flows past the towns of Kalavryta and Diakopto, and flows into the Gulf of Corinth near Diakopto. Its length is 40 km. The name is derived from Boura, a mythological daughter of Ion and Helice who was beloved by Hercules, who according to legend opened the gorge in order to get close to her. This is the Vouraikos gorge, which has a length of about 20 km. In the gorge the river passes through dense vegetation and tunnels with many caves, passes and crags., Southern Europe is the southern region of the European continent. Most definitions of Southern Europe, also known as Mediterranean Europe, include the countries of the Iberian peninsula (Spain and Portugal), the Italian peninsula, Southern France, Greece and Malta. Other definitions sometimes include the Balkan countries of Southeast Europe, which are geographically technically in the southern part of Europe, but which have different historical, political, economic, and cultural backgrounds that commonly places them in the category of Eastern Europe., Oberkochen is a town (officially a city, despite its size) in the Ostalbkreis, in Baden-Württemberg, in Germany, central Europe., Patras (, Classical Greek and Katharevousa:  , ) is Greece's third-largest city and the regional capital of Western Greece, in the northern Peloponnese, west of Athens. The city is built at the foothills of Mount Panachaikon, overlooking the Gulf of Patras., Thessaloniki is the second-largest city in Greece and the capital of Greek Macedonia, the administrative region of Central Macedonia and the Decentralized Administration of Macedonia and Thrace. Its nickname is   ("Symprotévousa"), literally "the co-capital", a reference to its historical status as the  ("Symvasilévousa") or "co-reigning" city of the Eastern Roman (Byzantine) Empire, alongside Constantinople., The euro (sign: €; code: EUR) is the official currency of the eurozone, which consists of 19 of the member states of the European Union: Austria, Belgium, Cyprus, Estonia, Finland, France, Germany, Greece, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Portugal, Slovakia, Slovenia, and Spain. The currency is also officially used by the institutions of the European Union and four other European countries, as well as unilaterally by two others, and is consequently used daily by some 337 million Europeans . Outside of Europe, a number of overseas territories of EU members also use the euro as their currency., The New Greek Telescope project of the National Observatory of Athens (NOA) was funded by the European Commission and the General Secretariat for Research and Technology of the Hellenic Ministry of Development. The telescope had its first light test in 2005, and became the largest telescope in Greece when it became fully operational at the Chelmos Observatory site in 2007. The telescope has a Ritchey-Chrétien configuration with a primary mirror with a diameter of 2.3 m. The mount is of the altazimuth kind. The telescope is operated by the Institute for Astronomy, Astrophysics, Space Applications and Remote Sensing (IAASARS) of the NOA., The Chelmos Observatory ( Greek :   ) is an observatory located at the top of mount Chelmos , near Kalavryta , southern Greece . It is the largest research infrastructure of the National Observatory of Athens . The observatory was completed and first opened in 2001 . Its main equipment is the Aristarchos 2.3 m Telescope , manufactured by German company Carl Zeiss AG. With the finance from the universities of Patras and Manchester ., Greece (' ), officially the Hellenic Republic (Greek: ' ), historically also known as Hellas ("" ), is a country in southeastern Europe. 
Greece's population is approximately 10.955 million as of 2015. Athens is the nation's capital and largest city, followed by Thessaloniki., Munich (also in British English ) is the capital and largest city of the German state of Bavaria, on the banks of River Isar north of the Bavarian Alps. Munich is the third largest city in Germany, after Berlin and Hamburg, and the 12th biggest city of the European Union, with a population of above 1.5 million. The Munich Metropolitan Region is home to 5.8 million people., Carl Zeiss is a German manufacturer of optical systems, industrial measurements and medical devices, founded in Jena, Germany in 1846 by optician Carl Zeiss. Together with Ernst Abbe (joined 1866) and Otto Schott (joined 1884) they built a base for modern optics and manufacturing. There are currently two parts of the company, Carl Zeiss AG located in Oberkochen with important subsidiaries in Aalen, Göttingen and Munich, and Carl Zeiss GmbH located in Jena., Aroania is a village and a former municipality in Achaea, West Greece, Greece. Since the 2011 local government reform it is part of the municipality Kalavryta, of which it is a municipal unit. The municipal unit has an area of 173.804 km. The population is 1,619 (2011 census). The seat of administration was in the town Psofida. The municipality is named after the village and the mountain., Carl Zeiss (11 September 1816  3 December 1888) was a German maker of optical instruments best known for the company he founded, "Carl Zeiss Jena" (now: "Carl Zeiss AG"). Zeiss made contributions to lens manufacturing that have aided the modern production of lenses. Raised in Weimar, Germany, he opened a lens-making workshop in the 1840s in the city of Jena. At first his lenses were only used in the production of microscopes, but when cameras were invented, his company began manufacturing high-quality lenses for cameras., Subject: chelmos observatory, Relation: located_on_terrain_feature, Options: (A) arctic ocean (B) aroania (C) athens (D) belgium (E) caucasus mountains (F) cyprus (G) eastern europe (H) estonia (I) eurasia (J) europe (K) france (L) germany (M) greece (N) iberian peninsula (O) isar (P) lower saxony (Q) peloponnese (R) portugal (S) southeast europe (T) southern europe
Example Output:
aroania