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

Ex Input:
'Highway 61 Revisited' and 'Blood On The Tracks' were both albums released by which popular singer?

Ex Output:
highway 61 revisited


Ex Input:
Who stars in the TV series Californication?

Ex Output:
californication


Ex Input:
Which is Britain's oldest cathedral?

Ex Output:

britain