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: AMERICAN POETRY 
Clue: He wrote "Memorial Rain" for his brother Kenneth MacLeish, a pilot whose plane was shot down during WWI

Answer: archibald macleish


Question: Category: DONKEYS & ELEPHANTS 
Clue: Or would you rather be one of these? (a cross between a male donkey & a female horse)

Answer: mule


Question: Category: GO "STATE"! 
Clue: Philander C. Knox, Daniel Webster & John Foster Dulles have all held this federal post

Answer:
secretary of state