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

Example Input: Who is the current Australian prime minister ?
Example Output: australia

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: Beatrice, Alice, Louise and Helena were daughters of which British monarch?
Example Output:
princess beatrice of the united kingdom