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: A LITTLE OF THE BUBBLY 
Clue: Roy Allen opened root beer stands in 1922 & introduced this brand name for his product
[A]: a&w


[Q]: Category: "TU" 
Clue: Creature seen here in a non-candid photo
[A]:
tuna