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

Ex Input:
Which British composer wrote the music used as the theme for Desert Island Discs  He also wrote the Dambusters march and the Knightsbridge march.?

Ex Output:
the dam busters


Ex Input:
Which Beatles song was also recorded by Peter Sellers?

Ex Output:
the beatles


Ex Input:
In which U.S. State is Disney World located?

Ex Output:

walt disney world