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 is the largest continent on Earth?

SOLUTION: earth

PROBLEM: Which major river has its source at the confluence of the rivers Brigach and Breg in the Black Forest?

SOLUTION: breg

PROBLEM: At the recent Tony Awards who won the award for Best Actress in a Play for her performance as Queen Elizabeth II in the play The Audience by Peter Morgan?

SOLUTION:
tony award for best actress in a play