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

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: What was the name of country music`s first superstar who died at the age of 29 from drink and drug abuse?
Example Output: country music

Example Input: In which 2010 film are the main characters played by Liam Neeson, Bradley Cooper, Quinton Jackson and Sharlto Copley?
Example Output:
bradley cooper