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: 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"
[A]: prague


[Q]: Category: ELEMENT NAMES 
Clue: Found by Carl Gustav Mosander, terbium is named for Ytterby, a village in this country
[A]: sweden


[Q]: Category: THE HECUBA, YOU SAY 
Clue: Hecuba lays a guilt trip on this eldest son for going into his final combat
[A]:
hector