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

Example Input: Which is the only Avril Lavigne song to have reached No.1 in the US Billboard Chart?
Example Output: avril lavigne

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

Example Input: Who directed the films 'Faster, Pussycat! Kill! Kill!' and 'Beyond The Valley Of The Dolls'?
Example Output:
faster, pussycat! kill! kill!