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: VERY JANUARY 
Clue: January is one of this many months in the year with a length of 31 days

Answer: 7


Question: Category: "WORLD" BOOK 
Clue: John Irving established his reputation with this 1978 book about the life of a novelist

Answer: "the world according to garp"


Question: Category: WORLD HISTORY 
Clue: The Portuguese captured Muscat, now the capital of this sultanate, c. 1508 but were driven out in 1650

Answer:
oman