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: ORIGINAL TITLES 
Clue: Hitler originally titled it "Four and a Half Years of Struggle Against Lies, Stupidity and Cowardice"
mein kampf

Category: STATE CAPITALS 
Clue: While Portland is Maine's main city, this is the capital
augusta

Category: NAME THE OPERA 
Clue: ("Habanera")

"carmen"