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.

Ex 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.

Ex Output:
Science

Ex Input:
George Meredith's bitter collection Modern Love is composed of works in a modified form of this style. Edmund Spenser's Amoretti is composed of eighty-nine of these, and Elizabeth Barrett Browning wrote a collection of them "from the Portuguese." Works in the English variety of this form can be divided into three quatrains and a couplet, and the Petrarchan type is divided into an octave and a sestet. For 10 points, name these fourteen-line poems.

Ex Output:
Literature

Ex Input:
After he lost a gubernatorial election to Pat Brown, this man told reporters they wouldn't have him to "kick around anymore." His presidency saw the establishment of the Environmental Protection Agency, and he was elevated to national prominence by his role in the Alger Hiss case. His Secretary of State (*) Henry Kissinger initiated Detente (day-TAHNT) and he signed the Anti-Ballistic Missile and first SALT treaties with the Soviet Union. His visit to the People's Republic of China opened diplomatic relations between it and the United States. For ten points, name this 37th President of the United States who resigned in the wake of the Watergate Scandal.

Ex Output:
History