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 CHIEFS 
Clue: He wrote 5 of the 85 "Federalist" essays
[EX A]: john jay

[EX Q]: Category: ART & ARTISTS 
Clue: An X-ray of his "Blue Boy" has revealed the figure of a small dog that was painted out
[EX A]: thomas gainsborough

[EX Q]: Category: BORROWED BOOK TITLES 
Clue: The title of this Robert Penn Warren novel comes from a nursery rhyme
[EX A]:
all the king\'s men