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: "W"HODUNNIT? 
Clue: He was the first U.S. president to be unanimously elected

Answer: george washington


Question: Category: I WROTE THAT! 
Clue: "Ottsy i Deti", aka "Fathers and Sons"

Answer: ivan turgenev


Question: Category: WALK THE LINE 
Clue: On film Mary Poppins says the children will tread the path described by this pair of proverbial adjectives

Answer:
the straight & narrow