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 simplicity, answers should be in all lower cased letters.
question:
Category: SCIENTISTS 
Clue: In 1543 he wrote, "Finally we shall place the sun himself at the center of the universe"
answer:
nicolaus copernicus


question:
Category: HISTORIC BOOKS 
Clue: It was written in 1924 in the fortress of Landsberg am Lech
answer:
mein kampf by adolf hitler


question:
Category: MAN IN SPACE 
Clue: Mission that put the third man on the moon
answer:

apollo 12