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: BUMPED FROM THE COVER OF TIME 
Clue: A cover titled "Declining American Birthrate" was canceled in 1974 when this man was pardoned
answer:
richard m. nixon


question:
Category: SAME FIRST & LAST LETTER 
Clue: An invisible emanation, or an intangible quality
answer:
aura


question:
Category: 4-LETTER RIVERS 
Clue: The Czechs call this 720-mile-long river the Labe
answer:

the elbe