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

Example Input: The Cato Street Conspiracy was a plot to kill which British Prime Minister?
Example Output: prime minister of the united kingdom

Example Input: What currency is used on Christmas Island?
Example Output: christmas island

Example Input: What lip-syncing duo had the hit Blame it on the Rain?
Example Output:
blame it on the rain