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

Example Input: In book and film, which vessel was commanded by Charlie Allnut?
Example Output: charlie allnut

Example Input: Which former Blue Peter presenter died in April 2004, aged 41?
Example Output: blue peter

Example Input: In Greek mythology, Elektra was the daughter of which king?
Example Output:
electra