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: BORDERS 
Clue: Argentina's border with this country is 3,200 miles long, about the same as its coastline
chile

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: WORLD HISTORY 
Clue: In January 1823 this son of an Irish immigrant resigned as Chile's supreme director

bernardo o\'higgins