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: And Then There Were None?

SOLUTION: and then there were none

PROBLEM: Which Australian Prime Minister famously disappeared whilst swimming off the coast of Victoria on December 17th 1967?

SOLUTION:
australia