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: LITERATURE 
Clue: The first sequel to this classic French novel was titled "Twenty Years After"

Answer: the three musketeers


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: HAPPY NEW YEAR 
Clue: On Jan. 1, 1502 Portuguese sailors arrived at this present-day city & thought the bay was a river

Answer:
rio de janeiro