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: THE QUOTABLE MAO 
Clue: "All reactionaries are paper" these animals
[EX A]: tigers

[EX Q]: Category: QUEEN ELIZABETH II 
Clue: It's Queen Elizabeth's official London residence
[EX A]: buckingham palace

[EX Q]: Category: DRAMA 
Clue: Sula & Helena are robotesses in this Karel Capek play
[EX A]:
"r.u.r."