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

Input: Consider Input: Which Best Picture nominated movie tells the story of US soldier, 'Chris' Kyle?

Output: chris kyle

Input: Consider Input: Which popular Doctor Who villains, it was revealed in 2011, are to be given 'a rest' by scriptwriters?

Output: doctor who

Input: Consider Input: Which is Charles Dickens' thirteenth published novel, its characters include: Uncle Pumblechook, Bentley Drummle, John Wemmick and Biddy?
Output: bentley drummle