Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.

The plays 'The Barber of Seville' and 'Marriage of Figaro' were written by whom?
the marriage of figaro

Which sprinter lit the Olympic flame at the 2000 Summer Olympic Games in Australia?
2000 summer olympics

What is the largest city in the province of Saskatchewan, Canada?

canada