Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.

Example Input: James Dearden wrote which book, made into a famous film directed by Adrian Lyne, in 1987?
Example Output: adrian lyne

Example Input: Bound for Glory is the 1943 autobiography of which singer-songwriter?
Example Output: bound for glory

Example Input: Who was the author of the book 'The Constant Gardener'?
Example Output:
the constant gardener