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.

[Q]: Category: CAN'T SMILE WITHOUT YOU 
Clue: It's the hard outer layer of a tooth
[A]: enamel


[Q]: Category: THE BIRDS & THE BEES 
Clue: This substance produced by bees is used in the making of candles & cosmetics
[A]: wax


[Q]: Category: COMMON COLD 
Clue: This 5-letter adjective refers to 2 places on earth & is frequently used befgore "opposite"
[A]:
polar