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

Who had a hit album with Back to Bedlam in 2005?
back to bedlam

Who painted The Card Players, at Feb 2012 the most expensive artwork in the world?
the card players

What was the name of Sigourney Weaver's character in the 'Alien' films?
sigourney weaver