instruction:
Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
question:
Which jockey rode Red Alligator to victory in the 1968 Grand National?
answer:
red alligator


question:
What was the last silent film in which Chaplin's little tramp appeared?
answer:
chaplin


question:
Who wrote the play Amadeus?
answer:

amadeus