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

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

Ex Output:
merritt wever


Ex Input:
Thereze Bazar and David van Day were better known as which duo?

Ex Output:
david van day


Ex Input:
Who composed the music for the oratorio, 'Belshazzar's Feast'?

Ex Output:

belshazzar's feast