instruction:
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.
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: QUOTES 
Clue: 19th century philosopher & poet who advised "Hitch your wagon to a star"
answer:
ralph waldo emerson


question:
Category: GRAMMAR 
Clue: Every complete sentence must have a subject & this part containing the verb
answer:

a predicate