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: Chris Martin is the lead singer with which band who had several hits in the 2000s?
Example Output: chris martin

Example Input: Whose 1984 novel Neuromancer, was one of the first cyberpunk novels?
Example Output:
cyberpunk