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

Example Input: Which singer provides the voice for Chef in South Park?
Example Output: chef

Example Input: In which city will the 2014 Tour de France begin?
Example Output: 2014 tour de france

Example Input: 'Smokestack Lightnin' and 'Red Rooster' were originally recorded by which Chicago blues singer?
Example Output:
chicago blues