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

Example Input: Where is David Cameron's Oxfordshire constituency?
Example Output: david cameron

Example Input: In book and film, which vessel was commanded by Charlie Allnut?
Example Output: charlie allnut

Example Input: In which country is Damascus, the oldest continually inhabited city in the world?
Example Output:
damascus