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

Example Input: Who was the only child vampire in Anne Rice`s novels?
Example Output: anne rice

Example Input: The Battle of Antietam was fought during which war?
Example Output: battle of antietam

Example Input: Which city held the 2012 Summer Olympics, making it the first city to host the Games three times?
Example Output:
2012 summer olympics