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: Which river begins in the Rocky Mountains in south-west Colorado, crosses New Mexico and forms the border between Mexico and the USA before reaching the Gulf of Mexico?
Example Output: new mexico

Example Input: The Chukchi, Beaufort, and Barents are all seas in which ocean?
Example Output:
chukchi sea