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.

[Q]: The Keo Nua Pass in this country is one of the few passes through the Annamese Cordillera (CORE-dee-YARE-uh). This nation's capital includes the Temple of the Trung Sisters and is located on the Red River. The imperial citadel of Dai Noi is found in this country's onetime capital Hue (hway). For 10 points, name this Southeast Asian nation that was reunified in 1975 after a bloody war between the communist north and U.S.-aligned south.
[A]: Social Science


[Q]: One ruler of this dynasty avoided a prophecy of his death by abdicating in favor of the puppet Yusufi for four days during his persecution of Nuqtavis. This dynasty was defeated at Gulnabad by the Ghilzai leader Mahmud. Its founder was victorious at Merv over the Uzbeks and had earlier overthrown the White Sheep dynasty. This dynasty was eventually supplanted by Karim Khan and the Zand dynasty, and its final rulers were puppets of Nadir Shah. Tahmasp I was a ruler of this dynasty, which was defeated at Chaldiran by Selim the Grim. Under Abbas I, this dynasty established a capital at Isfahan, and it was founded with the help of the Qizilbash by Ismail I. For 10 points, name this Shi'ite dynasty that ruled Persia from 1501 to 1736.
[A]: History


[Q]: The maximum possible volume for the geometric figure known as Gabriel's Horn is this quantity. The square root of two divided by two is the first product of an infinite sequence of terms named for Viete [vee-ET] that expresses this quantity. The value of the Riemann zeta function at two is equal to this quantity squared divided by six. The period of the tangent function is equal to this quantity. The number e raised to the product of i and this quantity is equal to negative one. For 10 points, name this transcendental number, the ratio of a circle's circumference to its diameter.
[A]:
Science