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

Ex Input:
And Then There Were None?

Ex Output:
and then there were none


Ex Input:
Which is the only Avril Lavigne song to have reached No.1 in the US Billboard Chart?

Ex Output:
avril lavigne


Ex Input:
Whose only UK chart-topping single was called 'Don't You Want Me'?

Ex Output:

don't you want me