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

Example Input: Who played boxer James Braddock in the 2005 biopic Cinderella Man?
Example Output: james j. braddock

Example Input: The 2002 Winter Olympics were held in which city?
Example Output: 2002 winter olympics

Example Input: Several associates of which gangster were killed by Al Capone's gang in the 'St. Valentine's Day Massacre' in 1929?
Example Output:
saint valentine's day massacre