You will be given a definition of a task first, then some input of the task.
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.

This country's neighbor tried to prevent other countries from recognizing it through the Hallstein [HAHL-shteen] Doctrine. For most of the time this country existed, Erich Mielke [AIR-ikh MIL-keh] headed its dominant secret police force, the Stasi [SHTAH-see]. This country was ruled by a State Council after the death of its only president, Wilhelm Pieck [VIL- helm PEEK]. For many years, that council was headed by Walter [VAL-tair] Ulbricht and then Erich Honecker. This country started as the occupation zone agreed to at the Yalta Conference under the control of the Soviet Union. Name this country that merged with its neighbor in 1990 following the fall of the Berlin Wall.
Output:
History