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: DIMENSIONS 
Clue: Don't lose the thread--there are 10 or so dimensions in this physics theory

Answer: string theory


Question: Category: O FOR A 
Clue: Completely humble yourself for small stones & pebbles

Answer: grovel for gravel


Question: Category: SPECIAL OPS MOVIES 
Clue: Army Rangers' struggles in this country are depicted in "Black Hawk Down"

Answer:
somalia