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

Example Input: Who has taken over the TV role of Doctor Who, from actor David Tennant?
Example Output: doctor who

Example Input: Who won the 2011 Booker Prize for 'The Sense of an Ending'?
Example Output: the sense of an ending

Example Input: The works of artists De Chirico, Andr Breton, Mir, Magritte, Dal and Ernst are examples of what art movement?
Example Output:
andre breton