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 consistency, answers should be in all lower cased letters.

[EX Q]: Category: THE NEAREST 
Clue: ...of your 4 limbs to your heart is this one
[EX A]: your left arm

[EX Q]: Category: POP MUSIC 
Clue: In 1989, Roger Daltrey, Pete Townshend & John Entwistle reunited as this group for an American tour
[EX A]: the who

[EX Q]: Category: 19th CENTURY BUSINESSMEN 
Clue: In 1873 he founded the J. Edgar Thomson works near Pittsburgh, naming the steel mill for the Penn. railroad president
[EX A]:
carnegie