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

Example Input: Brenda Mae Tarpley achieved fame under what name?
Example Output: brenda mae tarpley

Example Input: Which Dickens novel is subtitled The Parish Boy's Progress?
Example Output: charles dickens

Example Input: Edward Gibbon was famed for which great historical work?
Example Output:
edward gibbon