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

Example Input: 'Edward Lewis' and 'Vivian Ward' were the principal characters in which popular 1990 film?
Example Output: edward lewis

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

Example Input: What was Andy Williams theme song?
Example Output:
andy williams