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

Example Input: Which British Prime Minister signed the 'Entente Cordiale' in 1904?
Example Output: prime minister of the united kingdom

Example Input: In which famous film did Michael Caine play a character named Charlie Croker?
Example Output: charlie croker

Example Input: Reginald Doherty, Arthur Gore and Fred Perry are associated with which sport?
Example Output:
fred perry