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

Ex Input:
Who stars in the TV series Californication?

Ex Output:
californication

Ex Input:
Richard Block and David Quayle founded which British-based DIY retailing company in 1969?

Ex Output:
david quayle

Ex Input:
Starship Troopers, Stranger in a Strange Land, The Moon is a Harsh Mistress, The Cat Who Walks Through Walls?

Ex Output:
stranger in a strange land