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 boxer won a 1.8m claim against promotor Frank Warren in March 2009?

SOLUTION: boxing

PROBLEM: What animal is the offspring of a male donkey and female horse?

SOLUTION:
horse