TASK DEFINITION: Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
PROBLEM: Which singer provides the voice for Chef in South Park?

SOLUTION: chef

PROBLEM: Come Clean was the debut album by which 2000s band?

SOLUTION: come clean

PROBLEM: Who was Anakin Skywalker's wife?

SOLUTION:
darth vader