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: AROUND THE U.S.A. 
Clue: Any Texan can tell you that this city is "Big D"

Answer: dallas


Question: Category: ABBR. 
Clue: Computer users should know that BBS stands for this

Answer: bulletin board system


Question: Category: LITERATURE 
Clue: In this novel, d'Artagnan, a native of Gascony, is described as "Don Quixote at 18"

Answer:
the three musketeers