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 Prime Minister married Clementine Hozier on September 12th 1908?

Ex Output:
clementine churchill


Ex Input:
Who was the only child vampire in Anne Rice`s novels?

Ex Output:
anne rice


Ex Input:
How are the novels 'Justine', 'Balthazar', 'Mountolive' and 'Clea' by Lawrence Durrell known collectively?

Ex Output:

clea