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

Ex Input:
Everything Changes, Beautiful World and Circus are all albums released by which British band?

Ex Output:
beautiful world


Ex Input:
In which famous film did Michael Caine play a character named Charlie Croker?

Ex Output:
charlie croker


Ex Input:
The German national anthem Der Deutschlandlied with words by Hoffman, has a tune by which composer?

Ex Output:

deutschlandlied