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

Example Input: The song Don't Rain On My Parade features in which musical?
Example Output: don't rain on my parade

Example Input: What is the official language of the Dominican Republic?
Example Output: dominican republic

Example Input: Which city state led the beaten Greek forces at the Battle of Thermopylae?
Example Output:
battle of thermopylae