In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.

Example Input: The highest point of this city is the Hermannskogel. A 20-ton bell made from captured Turkish cannons can be found in this city's St. Stephen's Cathedral. This city's chief park, the Prater, is known for its giant Ferris wheel. This city is home to the Ringstrasse (RING-strah-suh), on which stands the Rathaus. This city is the headquarters for the International Atomic Energy Agency and OPEC, and this city is located on the Danube River. For 10 points, name this capital of Austria.
Example Output: Social Science

Example Input: A maximum independent set for this data structure can be found in linear time by adding alternating levels. In this structure, any two vertices or nodes must be connected by a single simple path, and thus it is connected and acyclic. By using (*) union-find with disjoint sets, one type of this structure containing all the vertices of a connected graph can be constructed. One variety of this data structure can be used to easily implement a binary search. This structure also comes in red-black and self-balancing-binary varieties. For 10 points, identify this data structure from computer science, a hierarchical graph in which "leaf" nodes ultimately flow from a "root" node.
Example Output: Science

Example Input: The Chehel Sotun was erected under the auspices of this dynasty. It weakened under the reign of Shah Tahmasp, and its troops were organized into ghulams, tofangchis, and topchis under the military reforms of the Englishman Robert Sherley. Before it lost the important Diyarbakir site, this dynasty's greatest leader expelled Portuguese traders from their most popular port, and its capital fell to Ghizlzai Afghans in 1722. Its founder captured Tabriz from the White Sheep federation of Uzbek Turkmen, and this dynasty was eventually supplanted by Nader Shah. Its capital was moved to Esfahan in the early 17th century, and it was founded by Isma'il I and reached its peak under Abbas I. Lasting from 1502 to 1736, for 10 points, name this dynasty that established Shi'a Islam as the state religion, and which was based in Iran. 
Example Output:
History