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: MUSIC LEGENDS 
Clue: His 2003 People magazine obituary was headlined "Fade to Black"
answer:
johnny cash


question:
Category: ANATOMY 
Clue: Organ whose workings were the subject of a 1604 work by Johannes Kepler
answer:
the eye


question:
Category: INTERNATIONAL SPORTS 
Clue: Jan Ullrich, the only German ever to win this event, has been nicknamed "Der Tourminator"
answer:

the tour de france