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

Example Input: Mr Barkis, Edward Murdstone and Tommy Traddles are all characters in which Charles Dickens novel?
Example Output: charles dickens

Example Input: The Church of the Savior on Spilled Blood, built on the site of the assassination of Tsar Alexander II, is in which Russian city?
Example Output: church of the savior on blood

Example Input: Which town is the administrative headquarters of Clackmannanshire District Council?
Example Output:
clackmannanshire