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

Example Input: What is the capital of the American state of Delaware Boise, Dover or Jefferson City?
Example Output: delaware

Example Input: Which city has sports teams known as the 'Maple Leafs' and the 'Blue Jays'?
Example Output: toronto blue jays

Example Input: Who was the 16th president of the U.S.A.,assasinated in 1865?
Example Output:
assassination