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

Example Input: Grace Anna Goodhue was the wife of which US President?
Example Output: grace coolidge

Example Input: In which US state would you find the cities of Chesapeake, Roanoke and Fredericksburg?
Example Output: fredericksburg

Example Input: What English comedian, who celebrates a birthday today, is known for characters such as Ali G, Borat, and Bruno, and will be starring as Freddie Mercury in an upcoming Queen movie?
Example Output:
ali g