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 Chuck Berry song is performed by Marty McFly at the end of the film Back to the Future?

SOLUTION: back to the future

PROBLEM: What was Paul McCartney's first solo album called?

SOLUTION: album

PROBLEM: Caroline Alice Roberts was the wife of which English composer?

SOLUTION:
caroline alice elgar