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: 3-LETTER WORDS 
Clue: For 5 & 7 it's 12

Answer: sum


Question: Category: PARTY OF "FIVE" 
Clue: After December 1944, it was Ike's rank

Answer: five-star general


Question: Category: MOVIES WITHIN MOVIES 
Clue: Cabbie Travis Bickle makes an unwise choice to see "Swedish Marriage Manual" with his date, Betsy, in this film

Answer:
taxi driver