Information:  - Stuttgart ( Swabian: "Schduagert"), often nicknamed the ""Schwabenmetropole"" in reference to its location in the center of Swabia and the local dialect spoken by some natives, is the capital and largest city of the German state of Baden-Württemberg. It is located on the Neckar river in a fertile valley locally known as the "Stuttgarter Kessel" an hour from the Swabian Jura and the Black Forest. Stuttgart's name comes from the Old High German word ""Stuogarten"," or "stud farm"  a reference to the city's founding in 950 AD as a stud farm. Stuttgarts urban area has a population of 623,738, and a further making it the sixth largest city in Germany, 2.7 million people live in the citys administrative region, and another 5.3 million people in its metropolitan area, making it the fourth largest metropolitan area in Germany.  - 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.  - 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.  - 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.  - Berlin is the capital and the largest city of Germany as well as one of its constituent 16 states. With a population of approximately 3.5 million people, Berlin is the second most populous city proper and the seventh most populous urban area in the European Union. Located in northeastern Germany on the banks of rivers Spree and Havel, it is the centre of the Berlin-Brandenburg Metropolitan Region, which has about 6 million residents from more than 180 nations. Due to its location in the European Plain, Berlin is influenced by a temperate seasonal climate. Around one-third of the city's area is composed of forests, parks, gardens, rivers and lakes.  - Marco Matias is the son of Portuguese immigrants who came to Germany in the 1970s . At the age of ten , he had his first experiences on stage when he was performing for a game circus , a project that arose in co-operation with Caritas and endeavored to inspire children for creativity . He himself got a lot of ideas out of this project . Shortly afterward , he founded a duet with his brother Jorge and they had a lot of success presenting their songs -- pop , rock and South American titles -- at various private events . The first band he joined when he was fifteen was called `` Lua Cheia '' . He gained his first studio experiences with his school band `` The Basement Kids '' during the production of his first CD `` Cry For Peace '' . He then passed his higher school certificate examination and began his studies at the University of Cologne . But he never gave up his music ; he worked as a backing vocalist , participated in jam sessions and had many other musical activities . At that time , he got in contact with the Cologne A cappella ensemble `` Voice Sings '' with whom he toured a lot . In 2000 , Marco and his band `` Atlanticos '' participated in a `` international Festival For Young People Of The Portuguese Communities 2000 '' . The festival was broadcast live to the Portuguese speaking territories all over the world . Portuguese people living in Australia , Macao , Brazil and other territories watched his performance and Marco and his band received a tremendous reaction from the televoters and made third place . They produced an album in Portuguese , and were doing a lot of TV - Shows and radio performances in the following years 2001 and 2002 . In 2003 , he was invited to a casting called `` The German Voice 2003 '' . He was elected from among 12,000 candidates and entered the final with nine other competitors . In that final he became second . `` A Miracle Of Love '' is the title of the song written by Ralph Siegel that Marco performed , together with Nicole Süßmilch , during the German pre-selection for...  - Frankfurt am Main is a metropolis and the largest city in the German state of Hesse and the fifth-largest city in Germany, with a 2015 population of 731,095 within its administrative boundaries, and 2.3 million in its urban area. The city is at the centre of the larger Frankfurt Rhine-Main Metropolitan Region, which has a population of 5.8 million and is Germany's second-largest metropolitan region after Rhine-Ruhr. Since the enlargement of the European Union in 2013, the geographic centre of the EU is about to the east of Frankfurt's CBD, the Bankenviertel. Frankfurt is culturally and ethnically diverse, with around half of the population, and a majority of young people, having a migration background. A quarter of the population are foreign nationals, including many expatriates.  - 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.  - Hamburg (local pronunciation ; Low German/Low Saxon: "Hamborg" ), officially "Freie und Hansestadt Hamburg" (Free and Hanseatic City of Hamburg), is the second largest city in Germany and the eighth largest city in the European Union. It is the second smallest German state by area. Its population is over 1.7 million people, and the wider Hamburg Metropolitan Region covers more than 5.1 million inhabitants. The city is situated on the river Elbe.  - 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.    After reading the paragraphs above, we are interested in knowing the entity with which 'marco matias ' exhibits the relationship of 'country of citizenship'. Find the answer from the choices below.  Choices: - austria  - belgium  - british  - cyprus  - estonia  - france  - frankfurt  - germany  - greece  - hamburg  - latvia  - luxembourg  - portugal  - württemberg
Answer:
portugal