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.

[EX Q]: Category: SIGNS & SYMBOLS 
Clue: Symbols of mystery, they're the mysterious doubles of the people who cast them
[EX A]: shadows

[EX Q]: Category: WORLD CAPITALS 
Clue: Ottawa, the capital of Canada, lies in the southeastern part of this province
[EX A]: ontario

[EX Q]: Category: COAL 
Clue: The most abundant & most widely used type of coal, it's also called "soft coal"
[EX A]:
bituminous