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: MARK ANTONYMS 
Clue: The traditional mark of someone who can't sign his name has this opposite in tic-tac-toe

Answer: o


Question: Category: CLASSIC ALBUM ART 
Clue: The album art of Paul Anka's 1976 "The Painter" was by this pop artist who also did the Stones' "Sticky Fingers"

Answer: andy warhol


Question: Category: TOUGH TV TRIVIA 2 
Clue: He was the second person to play Chester A. Riley on TV; Jackie Gleason was first

Answer:
william bendix