You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For simplicity, answers should be in all lower cased letters.

[EX Q]: Category: TV BEFORE & AFTER 
Clue: Jack Bauer saddles up & joins 3 friends bringing about the end of the world
[EX A]: 24 horsemen of the apocalypse

[EX Q]: Category: OPERAS BASED ON PLAYS 
Clue: "The Queen of Cornwall", from a play by this author, premiered "Far from the Madding Crowd", in Glastonbury
[EX A]: thomas hardy

[EX Q]: Category: ASTRONOMY 
Clue: This "Critique of Pure Reason" author called some fuzzy objects "island universes" in 1775; he was right
[EX A]:
immanuel kant