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: AROUND THE HOUSE 
Clue: A silent butler is used to collect these during or after a meal

A: crumbs
****
Q: Category: WASHINGTON STATE 
Clue: This dam on the Columbia River has a generating capacity of nearly 6.5 million kilowatts

A:
grand coulee dam
****