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

Example Input: The Battle of Poltava in 1709 was a victory by Peter the Great over which state?
Example Output: battle of poltava

Example Input: Who won the Women's Singles at the 2015 Australian Open Tennis Championships?
Example Output: the championships, wimbledon

Example Input: Detective Inspector Edmund Reid, Bennet Drake and Captain Jackson are characters in which TV crime series?
Example Output:
bennet drake