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: TO PROTECT 
Clue: This "service" is best known for protecting the president, but also investigates forgery
[EX A]: the secret service

[EX Q]: Category: THE INSTRUMENT OF DEATH 
Clue: In 1793 Jean-Paul Marat was retired in the bath with one of these
[EX A]: a knife

[EX Q]: Category: BROADWAY LYRICS 
Clue: "The sweetest sounds I'll ever hear are still inside" this part of me
[EX A]:
head