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: PLACES FOR ANIMALS 
Clue: This word refers to extreme opposites or a type of bear
[EX A]: polar

[EX Q]: Category: WHAT'S THE BIG IDEA? 
Clue: The 21st century doctrine named for this man allows the U.S. to wage preventive war if an attack on us is coming
[EX A]: george w. bush

[EX Q]: Category: "MUM"s THE WORD 
Clue: Formerly called Bombay, it's in the top 5 cities in the world in population
[EX A]:
mumbai