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: LETHAL WEAPONS 
Clue: In the largest man-made explosion in history, the USSR detonated a 50-megaton one of these in 1961
answer:
a hydrogen bomb


question:
Category: ON OUR MONEY 
Clue: Appropriately, this landmark is on the reverse of the $5 bill
answer:
the lincoln memorial


question:
Category: AT THE DRUGSTORE 
Clue: Its fast-acting formula "gets the red out"
answer:

visine