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 consistency, answers should be in all lower cased letters.

Q: Category: FRANKS 
Clue: The Atreides family, exiled on Arrakis, starred in the "Chronicles of Dune" by this sci-fi author

A: frank herbert
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Q: Category: "N" JOY 
Clue: A songbird, or the last name of nursing pioneer Florence

A: nightingale
****
Q: Category: U.S. GOVERNMENT 
Clue: When a bill reaches the President's desk, he may sign it, do nothing or do this

A:
veto
****