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

Example Input: Which biologist was known as Darwin's Bulldog?
Example Output: charles darwin

Example Input: Which Noble prize-winning novelist is best known for 'And Quiet Flows the Don?
Example Output: and quiet flows the don

Example Input: Alana Hamilton, Penny Lancaster and Rachel Hunter have all been married to which British singer?
Example Output:
penny lancaster