Please answer the following question: Information:  - Bayer AG ( / bar / ; German pronunciation : ( ba ) ) is a German multinational chemical and pharmaceutical company founded in Barmen ( today a part of Wuppertal ) , Germany in 1863 . It is headquartered in Leverkusen , North Rhine - Westphalia , Germany , where its illuminated sign is a landmark . Bayer 's primary areas of business include human and veterinary pharmaceuticals ; consumer healthcare products ; agricultural chemicals and biotechnology products ; and high value polymers . The company is a component of the Euro Stoxx 50 stock market index . Bayer lost its US business after World War I and during World War II was part of IG Farben and participated in Nazi war crimes . IG Farben was broken up after WWII and Bayer became independent again , and in 1978 it bought back its name in the US . Bayer 's first and best known product was aspirin ; there is a dispute about what scientist at Bayer made the most important contributions to it , Arthur Eichengrün or Felix Hoffmann . Bayer trademarked `` heroin '' and marketed it as a cough suppressant and non-addictive substitute for morphine from 1898 to 1910 . Bayer also introduced phenobarbital , prontosil , the first widely used antibiotic and the subject of the 1939 Nobel Prize in Medicine , the antibiotic Cipro ( ciprofloxacin ) , and Yaz ( drospirenone ) birth control pills . In 2014 Bayer bought Merck 's consumer business , with brands such as Claritin , Coppertone and Dr. Scholl 's . Its BayerCropscience business develops genetically modified crops and pesticides . Its materials science division makes polymers like polyurethanes and polycarbonate . Bayer has been involved in controversies regarding some of its drug products ; its statin drug Baycol ( cerivastatin ) was discontinued in 2001 after 52 people died from renal failure , and Trasylol ( Aprotinin ) , used to control bleeding during major surgery , was withdrawn from the markets worldwide when reports of increased mortality emerged ; it was later re-introduced in Europe but not in the US . Bayer...  - Leverkusen is a city in North Rhine-Westphalia, Germany on the eastern bank of the Rhine. To the South, Leverkusen borders the city of Cologne and to the North is the state capital Düsseldorf.  - Molecular engineering is an emerging field of study concerned with the design and testing of molecular properties, behavior and interactions in order to assemble better materials, systems, and processes for specific functions. This approach, in which observable properties of a macroscopic system are influenced by direct alteration of a molecular structure, falls into the broader category of bottom-up design.  - Biotechnology is the use of living systems and organisms to develop or make products, or "any technological application that uses biological systems, living organisms, or derivatives thereof, to make or modify products or processes for specific use" (UN Convention on Biological Diversity, Art. 2). Depending on the tools and applications, it often overlaps with the (related) fields of bioengineering, biomedical engineering, biomanufacturing, molecular engineering, etc.  - In biology, an organism is any contiguous living system, such as an animal, plant, fungus, archaeon, or bacterium. All known types of organisms are capable of some degree of response to stimuli, reproduction, growth and development and homeostasis. An organism consists of one or more cells; when it has one cell it is known as a unicellular organism; and when it has more than one it is known as a multicellular organism. Most unicellular organisms are of microscopic scale and are thus loosely described as microorganisms. Humans are multicellular organisms composed of many trillions of cells grouped into specialized tissues and organs.  - The stock (also capital stock) of a corporation is constituted of the equity stock of its owners. A single share of the stock represents fractional ownership of the corporation in proportion to the total number of shares. In liquidation, the stock represents the residual assets of the company that would be due to stockholders after discharge of all senior claims such as secured and unsecured debt. Stockholders' equity cannot be withdrawn from the company in a way that is intended to be detrimental to the company's creditors.  - Cologne is the largest city in the German federal State of North Rhine-Westphalia and the fourth-largest city in Germany (after Berlin, Hamburg, and Munich). It is located within the Rhine-Ruhr metropolitan region, one of the major European metropolitan regions and the largest in Germany, with more than ten million inhabitants.  - A stock index or stock market index is a measurement of the value of a section of the stock market. It is computed from the prices of selected stocks (typically a weighted average). It is a tool used by investors and financial managers to describe the market, and to compare the return on specific investments.  - The EURO STOXX 50 is a stock index of Eurozone stocks designed by STOXX, an index provider owned by Deutsche Börse Group. According to STOXX, its goal is "to provide a blue-chip representation of Supersector leaders in the Eurozone". It is made up of fifty of the largest and most liquid stocks. The index futures and options on the EURO STOXX 50, traded on Eurex, are among the most liquid such products in Europe and the world.  - The eurozone, officially called the euro area, is a monetary union of 19 of the 28 European Union (EU) member states which have adopted the euro (€) as their common currency and sole legal tender. The monetary authority of the eurozone is the Eurosystem. The other nine members of the European Union continue to use their own national currencies, although most of them are obliged to adopt the euro in future.  - Düsseldorf (Low Franconian, Ripuarian: "Düsseldörp" ) is the capital city of the German state of North Rhine-Westphalia and the seventh most populous city in Germany. Düsseldorf is an international business and financial centre, renowned for its fashion and trade fairs. The city is headquarters to one Fortune Global 500 and two DAX companies. Messe Düsseldorf organises nearly one fifth of premier trade shows.  - The Rhine (, , ) is a European river that begins in the Swiss canton of Graubünden in the southeastern Swiss Alps, forms part of the  Swiss-Austrian, Swiss-Liechtenstein, Swiss-German and then the Franco-German border, then flows through the Rhineland and eventually empties into the North Sea in the Netherlands.  The largest city on the river Rhine is Cologne, Germany, with a population of more than 1,050,000 people. It is the second-longest river in Central and Western Europe (after the Danube), at about , with an average discharge of about .  - A stock market, equity market or share market is the aggregation of buyers and sellers (a loose network of economic transactions, not a physical facility or discrete entity) of stocks (also called shares), which represent ownership claims on businesses; these may include "securities" listed on a stock exchange as well as those only traded privately.  - Germany, officially the Federal Republic of Germany, is a federal parliamentary republic in central-western Europe. It includes 16 constituent states, covers an area of , and has a largely temperate seasonal climate. With about 82 million inhabitants, Germany is the most populous member state of the European Union. After the United States, it is the second most popular immigration destination in the world. Germany's capital and largest metropolis is Berlin. Other major cities include Hamburg, Munich, Cologne, Frankfurt, Stuttgart and Düsseldorf.  - Biomedical engineering (BME) is the application of engineering principles and design concepts to medicine and biology for healthcare purposes (e.g. diagnostic or therapeutic). This field seeks to close the gap between engineering and medicine, combining the design and problem solving skills of engineering with medical and biological sciences to advance health care treatment, including diagnosis, monitoring, and therapy. Biomedical engineering has only recently emerged as its own study, compared to many other engineering fields. Such an evolution is common as a new field transitions from being an interdisciplinary specialization among already-established fields, to being considered a field in itself. Much of the work in biomedical engineering consists of research and development, spanning a broad array of subfields (see below). Prominent biomedical engineering applications include the development of biocompatible prostheses, various diagnostic and therapeutic medical devices ranging from clinical equipment to micro-implants, common imaging equipment such as MRIs and EEGs, regenerative tissue growth, pharmaceutical drugs and therapeutic biologicals.  - North Rhine-Westphalia (, commonly shortened to NRW) is the most populous state of Germany, with a population of approximately 18 million, and the fourth largest by area. Its capital is Düsseldorf; the most populous city is Cologne. Four of Germany's ten largest citiesCologne, Düsseldorf, Dortmund, and Essenare located within the state, as well as the largest metropolitan area on the European continent, Rhine-Ruhr.  - STOXX Limited is a globally integrated index provider, covering the world markets across all asset classes  developing, maintaining, distributing and marketing a comprehensive global family of strictly rules-based and transparent indices. STOXX is a wholly owned subsidiary of Deutsche Börse Group. STOXX calculates more than 7,500 indices and in addition acts as the marketing agent for the indices of Deutsche Börse indices like DAX.  - Engineers design materials, structures, and systems while considering the limitations imposed by practicality, regulation, safety, and cost. The word "engineer ("from the Latin "ingeniator"")" is derived from the Latin words "ingeniare" ("to contrive, devise") and "ingenium" ("cleverness"). The foundation education of an engineer is typically a 4-year bachelor's degree or in some countries, a master's degree in an engineering discipline plus 46 years peer-reviewed professional practice culminating in a project report or thesis. Engineers who seek a professional engineer license in N. America will be required to take further exams in ethics, law and professional practice.    After reading the paragraphs above, we are interested in knowing the entity with which 'bayer' exhibits the relationship of 'part of'. Find the answer from the choices below.  Choices: - 16  - animal  - art  - asset  - biology  - biotechnology  - cell  - city  - company  - dax  - design  - education  - engineering  - equipment  - europe  - european union  - facility  - family  - german  - hamburg  - law  - liquid  - may  - medicine  - munich  - order  - part  - plant  - rhine  - state  - state of germany  - system  - therapy  - trade  - word
Answer:
dax