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: BELCHING 
Clue: Before a volcano belches it forth, it's called magma
lava

Category: I HEAR A SYMPHONY 
Clue: Mozart's 38th is called by the name of this city that stood in for Vienna in the filming of "Amadeus"
prague

Category: HIGHER EDUCATION 
Clue: South Carolina military college whose name sound like a fortress

the citadel