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

Example Input: Responsible for such films as 'Saving Private Ryan' and 'Gladiator', which film Production Company was founded by Steven Spielberg, Jeffrey Katzenberg and David Geffen in 1994?
Example Output: saving private ryan

Example Input: Carpo and Elara are moons of which planet?
Example Output: elara

Example Input: Callisto and Io are moons that orbit which planet?
Example Output:
io