Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.

Who bad a number 1 in the 1980's with Circle in the Sand?
circle in the sand

Which Nation does Aston Villa Goalkeeper Brad Guzan represent?
brad guzan

The film musical, Cabaret was based on the short novel, Goodbye to Berlin, written in the 1930's by which British author?

goodbye to berlin