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.

Category: PASTIMES 
Clue: The FCC assigns call signs, like N8DNR, to use in this hobby
ham radio

Category: ALL ABOUT PRESIDENTS 
Clue: I might worry about hanging around with him--he was nicknamed the "Hangman of Buffalo"
grover cleveland

Category: "AE" 
Clue: An aggressive form of karate, this Korean martial art uses punches, chops & flashy kicks

tae kwon do