TASK DEFINITION: Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
PROBLEM: Who painted The Card Players, at Feb 2012 the most expensive artwork in the world?

SOLUTION: the card players

PROBLEM: Which evolutionary biologist wrote The Ancestor's Tale in 2004?

SOLUTION: the ancestor's tale

PROBLEM: Who plays Batman in the 2005 film 'Batman Begins'?

SOLUTION:
batman begins