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.

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

[EX Q]: Category: ALLITERATION 
Clue: Football, baseball & water polo when watched rather than played
[EX A]: a spectator sport

[EX Q]: Category: OBJECTS 
Clue: In the 1930s, with its top-loading model, Swingline revolutionized this device
[EX A]:
a stapler