TASK DEFINITION: Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
PROBLEM: In which opera does a hunchback jester help his master, the Duke of Mantua, to seduce the daughter of a courtier?

SOLUTION: duke of mantua

PROBLEM: Which of these was the title of Bobby Darin's first million selling single?

SOLUTION: bobby darin

PROBLEM: Where is the Bagram air base?

SOLUTION:
bagram