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 Q]: proteins bind one end of these structures and help inhibit a process called "catastrophe. " These structures can have persistence lengths of 3-4 mm, which is several orders of magnitude higher than the average cellular diameter. These structures can be severed by katanin. Drugs such as paclitaxel stabilize these structures and prevent their depolymerization, where colchicine prevents its dimeric subunits from coming together. Shortening of these structure at the kinetochore ends of the spindle apparatus helps chromosomes walk towards poles during mitosis and meiosis. For 10 points, identify these structures which are components of the cytoskeleton and which are made of tubulin proteins.
[EX A]: Science

[EX Q]: In this novel, the protagonist's wife is raped by Phil Connor, and the protagonist's final job in this novel is at Tommy Hind's hotel. Mike Scully's War-Whoop League provides political favor to impoverished workers in this novel. This novel begins with the traditional Lithuanian Veselija wedding feast in which Ona and the protagonist, Jurgis Rudkus, are married in Packingtown. For 10 points, name this novel by Upton Sinclair that graphically described Chicago's meat industry.
[EX A]: Literature

[EX Q]: Preparations included the construction of the Zoan Church earthworks, and it began with the decimation of the 11th Corps under Oliver Howard. At the same time as the main action of this battle, Marye's Heights was taken from Jubal Early by John Sedgwick, but Sedgwick could not advance further than Salem Church to aid the Union effort here. This battle occurred after Lee challenged the crossing of Kelly's Ford by Hooker and resulted in Hooker pulling back across the Rappahannock. FTP, name this battle which featured the accidental death of Stonewall Jackson.
[EX A]:
History