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 1995 'Space' move starred Tom Hanks; Bill Paxton and Kevin Bacon?

SOLUTION: tom hanks

PROBLEM: In what story of Arthur C. Clarke do Tibetan monks seek to list all the names of God as they believe He will bring the Universe to an end once this is done?

SOLUTION: arthur c. clarke

PROBLEM: Circus was a 2008 single and album by which popstar?

SOLUTION:
circus