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.

Category: FRENCH 
Clue: Un cheval is a horse; cheveux is this, as on one's tete
hair

Category: DONKEYS & ELEPHANTS 
Clue: Or would you rather be one of these? (a cross between a male donkey & a female horse)
mule

Category: THAT'S GREAT, PETER THE GREAT! 
Clue: Peter was born in 1672 within the walls of this sprawling Moscow fortress

the kremlin