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

Example Input: Who wrote the 1939 book The Big Sleep?
Example Output: the big sleep

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

Example Input: Premiered in 1947 which composer wrote the music for the opera 'Albert Herring'?
Example Output:
albert herring