TASK DEFINITION: Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
PROBLEM: The plays 'The Barber of Seville' and 'Marriage of Figaro' were written by whom?

SOLUTION: the marriage of figaro

PROBLEM: Which European country has the Cupon as its currency?

SOLUTION: moldovan cupon

PROBLEM: Sold for $100 million in 2008, 'Eight Elvises' is which artist's most expensive painting?

SOLUTION:
eight elvises