TASK DEFINITION: Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
PROBLEM: Who played Bonnie in the 1967 film `Bonnie And Clyde`?

SOLUTION: bonnie and clyde

PROBLEM: What is the country of origin of the cheese called caerphilly?

SOLUTION: caerphilly cheese

PROBLEM: Which delta blues musician wrote Love in Vain, Cross Road Blues, and Rambling on My Mind?

SOLUTION:
love in vain