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.
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Question: Category: ART 
Clue: In 1546 Pope Paul III appointed this artist architect of St. Peter's Basilica

Answer: michelangelo


Question: Category: YOU GET AN "F" 
Clue: These seedless, nonflowering plants reproduce by spores on the undersides of their fronds

Answer: ferns


Question: Category: WHAT'S UP, DOC? 
Clue: The person who takes your x-rays wears a film badge to monitor exposure to this

Answer:
radiation