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.
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Question: Category: MUSIC 
Clue: Webster's defines this word as "a chord of three tones consisting of a root with its third and fifth"

Answer: a triad


Question: Category: HISTORY 
Clue: In 1720 Victor Amadeus II of Savoy gave Sicily to Austria in exchange for this other large island

Answer: sardinia


Question: Category: THE 1890s 
Clue: Japan had an emperor, Russia, a czar & Italy was ruled by one of these

Answer:
king