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: 3-LETTER WORDS 
Clue: For 5 & 7 it's 12
[A]: sum


[Q]: Category: SEX CHANGES 
Clue: Don't let the pearls fool you, these lady bivalves can change into males when it suits them
[A]: oysters


[Q]: Category: LITTLE LANDS 
Clue: Bhet you can name this country nestled in the Himalayas between India & China; it's about half the size of Indiana
[A]:
bhutan