TASK DEFINITION: Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
PROBLEM: Which English king was married to Eleanor of Castile?

SOLUTION: eleanor of castile

PROBLEM: Miss Rosa Dartle is a character in which Charles Dickens novel?

SOLUTION: james steerforth

PROBLEM: Tell Me Why is featured in which Beatles film?

SOLUTION:
the beatles