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.

[Q]: Category: ANCIENT GREEKS 
Clue: This actor of the 6th century B.C. is credited with introducing the use of masks on stage
[A]: thespis


[Q]: Category: SOUP ALPHABET 
Clue: "B" is for this thin soup; Swanson's makes beef, chicken & vegetable varieties
[A]: broth


[Q]: Category: ART 
Clue: Now in the British Museum, the sculptures known as these marbles once adorned the Parthenon
[A]:
elgin marbles