TASK DEFINITION: Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
PROBLEM: With eight goals which Barcelona player was the leading scorer in the 2009-10 Champions League?

SOLUTION: barcelona

PROBLEM: Charon is a moon which orbits which body?

SOLUTION: charon

PROBLEM: Who played Anna in the film version of 'The King and I'?

SOLUTION:
anna