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

Example Input: What country has an official residence called Blair House, kept for guests of the leader of the country?
Example Output: blair

Example Input: Zoey Barkow, Kevin Peyton, Eddie Walzer and Fitch Cooper are all characters in which US television series?
Example Output: merritt wever

Example Input: Ben Fogle, the TV presenter and adventurer is the son of which well-known actress?
Example Output:
ben fogle