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

Example Input: Who directed the 2005 film 'Brokeback Mountain'?
Example Output: brokeback mountain

Example Input: Which was the title of the 7th and final book in the Chronicles of Narnia by C.S. Lewis?
Example Output: the chronicles of narnia

Example Input: Who did Mohammed Ali fight in the 1974 boxing match dubbed 'The Rumble In The Jungle'?
Example Output:
boxing