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: A NOSE FOR GNUS 
Clue: A main predator of the adult gnu, it has a mane, too

Answer: lion


Question: Category: ANIMALS IN LITERATURE 
Clue: This knight errant's steed in Rocinante, a draft horse originally belonging to his neighbor

Answer: don quixote


Question: Category: NONFICTION 
Clue: This tennis great who passed away in 1993 left behind the memoir "Days Of Grace"

Answer:
arthur ashe