instruction:
Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
question:
Who wrote the novel 'Brideshead Revisited'?
answer:
brideshead revisited


question:
In which famous film did Michael Caine play a character named Charlie Croker?
answer:
charlie croker


question:
From what is the Indian dish dhal made?
answer:

dal