Given a broad category, generate a trivia-type question based on a specific entity in that category. The question should be non-ambiguous. External resources such as Wikipedia could be used to obtain the facts.

Example input: boat
Example output: In 1907, which ill-fated liner of the Cunard Line made its maiden voyage?
Example explanation: The question is asking about a boat/ship.
Q: astronomy
A:
Caliban is a moon that orbits which planet?