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.

Q: Category: WHO PLAYED 'EM ON TV? 
Clue: Army company clerk Radar O'Reilly

A: gary burghoff
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Q: Category: SAME FIRST & LAST LETTER 
Clue: An invisible emanation, or an intangible quality

A: aura
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Q: Category: ENERGY 
Clue: Nearly all artificial satellites are powered by batteries charged by this

A:
sun
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