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

Example Input: Cassandra, Grizabella and Skimbleshanks are all characters in which Andrew Lloyd Webber musical?
Example Output: andrew lloyd webber

Example Input: Which film was based on the story The Sentinel by Arthur C Clarke?
Example Output: arthur c. clarke

Example Input: From which Bob Dylan song does the following come: Now you don't talk so loud, now you don't seem so proud about havin' to be scrounging for your next meal?
Example Output:
bob dylan