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:
In which city was Christopher Columbus born?
answer:
columbus


question:
Which band did David Coverdale form afer he left Deep Purple?
answer:

deep purple