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.

[Q]: Category: CLOTHING 
Clue: They can be crew, knee, or bobby
[A]: socks


[Q]: Category: OFFICIAL LANGUAGES 
Clue: Official language in common to the Central African Republic & Canada
[A]: french


[Q]: Category: GEOLOGY 
Clue: A large area of land lying at the "foot of a mountain", it shares its name with a region in northwest Italy
[A]:
a piedmont