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.

Category: BEIN' GREEN 
Clue: A mini matador may take it on:
bullfrog

Category: ROCKS & MINERALS 
Clue: A mixture containing antimony is sprayed on canvas to render it this
fireproof

Category: ANIMAL PHRASES 
Clue: To ward off hunger is to keep this animal "from the door"

wolf