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 consistency, answers should be in all lower cased letters.
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Question: Category: IN THE PAST MILLENNIUM
Clue: In 1066 this group conquered England

Answer: normans

Question: Category: FIREFIGHTING
Clue: Early NYC firemen were alerted with rattles--so you might have a 3-rattle fire where today we'd have this equivalent

Answer: a 3-alarm fire

Question: Category: MUSICAL INSTRUMENTS
Clue: Jascha Heifetz taught a master class on this instrument at USC

Answer:
the violin