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

Example Input: The Ivy League University 'Dartmouth College' is in which US state?
Example Output: dartmouth college

Example Input: What was the last silent film in which Chaplin's little tramp appeared?
Example Output: chaplin

Example Input: In Greek mythology who was the mother of Achilles?
Example Output:
achilles