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

Example Input: Alexander the Great died in which ancient city?
Example Output: alexander the great

Example Input: Which Union leader of the American Civil War gave his name to a tree in California's 'Sequoia National Park'?
Example Output: american civil war

Example Input: Which Carry On film features characters The Khasi of Kalabar, Private James Widdle and the 3rd Foot and Mouth Regiment?
Example Output:
carry on