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]: Coombs tests detect these bodies bound to erythrocytes, and a technique that uses these entities is ELISA. These molecules have a namesake fold, in which two beta sheets are held together by amino acid charges. These adaptable molecules can somatically recombine in a process called V(D)J recombination and are also capable of changing isotype by altering conformation of their heavy chains. Like enzymes, they operate via a a so-called "lock-and-key" mechanism, as verified by Linus Pauling. FTP, name these characteristically y-shaped immune molecules exploited in vaccination and produced by B cells in response to specific antigens.
[A]: Science


[Q]: This composer's Fourth Symphony in E Minor contained 30 variations on a theme from J.S. Bach's Cantata No. 150, while his acquaintance with Richard Muhlfeld inspired his Trio for Clarinet and Quintet for Clarinet and Strings. He composed a cantata based on Tasso's Jerusalem Delivered entitled Rinaldo, and collaborated with Dietrich and another composer on the F-A-E Sonata. In 1869, this man composed a series of Love Songs, and in the same year released his two volumes of piano duets based on Gypsy folk tunes, Hungarian Dances. The partner to his Tragic Overture was also composed for the University of Breslau. FTP, identify this composer whose works include A German Requiem and the Academic Festival Overture.
[A]: Fine Arts


[Q]: Albert Parsons led a march down Michigan Street in a parallel to this event that did not end in violence. As a result of this event, August Spies and 7 other men were hanged after quick and dubious trials. After Samuel Fielden spoke, a member of the crowd threw a bomb at a police officer, which killed him. The Knights of Labor were blamed by the public for this event, although it was primarily caused by desire for an 8 hour work day. FTP, identify this May 4, 1888 event which saw a violent conflict between laborers at the McCormick Harvester plant and the police.
[A]:
History