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 hero of science fiction was created by Alex Raymond?

SOLUTION: alex raymond

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: Who was the prolific writer of theme music for 1960s TV shows including Steptoe and Son, Dr Who, The Prisoner, Dangerman and Tales of the Unexpected?

SOLUTION:
the prisoner