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.

Category: FREUD 
Clue: The one great question Freud said he could not answer was "What does" one of these "want?"
a woman

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

Category: COLORFUL BOOKS 
Clue: In 1941 Walter Farley created this now-classic animal tale

"the black stallion"