TASK DEFINITION: Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
PROBLEM: Carpo and Elara are moons of which planet?

SOLUTION: elara

PROBLEM: Which actor spoke the line I love the smell of napalm in the morning* in the 1979 film Apocalypse Now?

SOLUTION: apocalypse now

PROBLEM: Darius Danesh (Campbell) became the youngest actor to play the role of Billy Flynn in which Broadway musical since it opened in 1975?

SOLUTION:
william flynn