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

Example Input: In which city will the 2014 Tour de France begin?
Example Output: 2014 tour de france

Example Input: Chris Martin is the lead singer with which band who had several hits in the 2000s?
Example Output: chris martin

Example Input: From 559 BC until 530 BC, Cyrus the Great was the leader of which ancient empire?
Example Output:
cyrus the great