Title: Austria
Content:  The Parliament of Austria is located in Vienna, the country's capital and most populous city. Austria became a federal, representative democratic republic through the Federal Constitution of 1920. The political system of the Second Republic with its nine states is based on the constitution of 1920, amended in 1929, which was reenacted on 1 May 1945. The head of state is the Federal President (Bundespräsident), who is directly elected by popular majority vote, with a run-off between the top-scoring candidates if necessary. The head of the Federal Government is the Federal Chancellor (Bundeskanzler), who is selected by the President and tasked with forming a government based on the partisan composition of the lower house of parliament. The government 
Title: Metropolis
Content:  Vienna is the capital city of Austria, an old imperial city, and the seat of many international organisations, including OPEC, as well as hosting a main office of the United Nations. Together with its cultural acumen and history, these features make Vienna the only metropolis in Austria.
Title: Austria
Content:  Austria, officially the Republic of Austria, is a landlocked country in the southern part of Central Europe, located on the Eastern Alps. It is composed of nine federated states, one of which is Vienna, Austria's capital and largest city. Austria is bordered by Germany to the northwest, the Czech Republic to the north, Slovakia to the northeast, Hungary to the east, Slovenia and Italy to the south, and Switzerland and Liechtenstein to the west. Austria occupies an area of 83879 km2 and has a population of nearly 9 million people. While Austrian German is the country's official language, many Austrians 
Title: Lower Austria
Content:  Lower Austria (Niederösterreich; Austro-Bavarian: Niedaöstareich, Niedaestareich) is one of the nine states of Austria, located in the northeastern corner of the country. Since 1986, the capital of Lower Austria has been Sankt Pölten, replacing Vienna which became a separate state in 1921. With a land area of 19186 km² and a population of 1.685 million people, Lower Austria is the second most populous federal state (after Vienna). Other large cities are Amstetten, Klosterneuburg, Krems an der Donau and Wiener Neustadt.
Title: Capital city
Content:  Wiesbaden, Mainz, Düsseldorf, Stuttgart, and Munich, as do all of the republics of the Russian Federation. The national capitals of Germany and Russia (the Stadtstaat of Berlin and the federal city of Moscow) are also constituent states of both countries in their own right. Each of the states of Austria and cantons of Switzerland also have their own capital cities. Vienna, the national capital of Austria, is also one of the states, while Bern is the (de facto) capital of both Switzerland and of the Canton of Bern. The majority of national capitals are also the largest city in their respective countries, but this is not the case in some countries.
Title: Graz
Content:  Graz (, ; Gradec) is the capital city of the Austrian state of Styria and second-largest city in Austria after Vienna. As of 1 January 2021, it had a population of 331,562 (294,236 of whom had principal-residence status). In 2018, the population of the Graz larger urban zone (LUZ) stood at 652,654, based on principal-residence status. Graz is known as a college and university city, with four colleges and four universities. Combined, the city is home to more than 60,000 students. Its historic centre (Altstadt) is one of the best-preserved city centres in Central Europe. In 1999, the city's historic centre was added to the UNESCO list of World Heritage Sites and in 2010 the designation was expanded to include Eggenberg Palace (Schloss Eggenberg) on the western edge of the city. Graz was designated the Cultural Capital of Europe in 2003 and became a City of Culinary Delights in 2008.
Title: Outline of Austria
Content:   The following outline is provided as an overview of and topical guide to Austria: Austria &ndash; landlocked sovereign country located in Central Europe. It borders both Germany and the Czech Republic to the north, Slovakia and Hungary to the east, Slovenia and Italy to the south, and Switzerland and Liechtenstein to the west. The capital is the city of Vienna on the Danube River.
Title: Municipality (Austria)
Content:  As of January 1, 2018 there are 15 statutory cities in Austria, 186 other cities, 770 market towns, and 1127 other communes, for a total of 2,098 municipalities. One of these municipalities stands out: the city of Vienna is a statutory city and a state at the same time. At 1,900,000 inhabitants, the national capital also seven times larger than the second most populous city, Graz. For the other eight states, the numbers are as follows (Statistik Austria 2018): With respect to population, there is wide variation within each class of municipalities: With respect to area, the smallest municipality is Rattenberg at 0.11 km2; the largest is Sölden in the thinly populated mountain territory of Tyrol at 466.78 km2. The city of Vienna ranks second, at 414.65 km2.
Title: Austria
Content:  Austria's population was estimated to be nearly 9 million (8.9) in 2020 by Statistik Austria. The population of the capital, Vienna, exceeds 1.9 million (2.6 million, including the suburbs), representing about a quarter of the country's population. It is known for its cultural offerings and high standard of living. Vienna is by far the country's largest city. Graz is second in size, with 291,007 inhabitants, followed by Linz (206,604), Salzburg (155,031), Innsbruck (131,989), and Klagenfurt (101,303). All other cities have fewer than 100,000 inhabitants. According to Eurostat, in 2018 there were 1.69 million foreign-born residents in Austria, corresponding to 19.2% of the total population. Of these, 928,700 (10.5%) were born outside the EU and 762,000 (8.6%) were born in another EU Member State. There are more than 483,100 descendants of foreign-born immigrants. Turks form one of the largest ethnic groups in Austria, numbering around 350,000. 
Title: Sankt Pölten
Content:  Sankt Pölten (Central Bavarian: St. Pödn), mostly abbreviated to the official name St. Pölten, is the capital and largest city of the State of Lower Austria in northeast Austria, with 55,538 inhabitants as of 1 January 2020. St. Pölten is a city with its own statute (or Statutarstadt) and therefore it is both a municipality and a district in the Mostviertel.

Question: what capital of austria?
Answer: Vienna.