instruction:
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.
question:
Category: THE HISTORY OF APRIL 9th 
Clue: 1959: NASA publicly introduces Messrs. Glenn, Shepard & the rest of this program's 7 astronauts
answer:
mercury


question:
Category: PRESIDENTIAL PETS 
Clue: Charlie, one of the Kennedys' dogs, was a distant offspring of the dog that played this role in "The Thin Man"
answer:
asta


question:
Category: A QUINTET OF QUOTES 
Clue: In an 18th c. quip, "When a man... is to be hanged in a fortnight, it" does this to "his mind wonderfully"
answer:

concentrates