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: Joseph Addison and Richard Steele founded (in 1711), and Boris Johnson edited, which British magazine?
Example Output: boris johnson

Example Input: Who wrote the 1952 play 'The Crucible'?
Example Output:
crucible