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: WEIGHTS & MEASURES 
Clue: Number of teaspoons in a tablespoon

Answer: 3


Question: Category: '60s ROCK 
Clue: In July 1967 this group's "Light My Fire" became Elektra Records' first No. 1 single

Answer: the doors


Question: Category: WINE 
Clue: The Douro Valley in this country is an important port producer

Answer:
portugal