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

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: Field Marshal Arthur Wellesley, shares his better known title with which Southern Hemisphere capital city?
Example Output: arthur wellesley, 1st duke of wellington

Example Input: What was Barbara Windsor's first Carry On film?
Example Output:
carry on