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.

[Q]: computer
[A]: Explorer, Chrome, Safari and Firefox are among the most globally popular what (in early 2000s)?


[Q]: measurement_unit
[A]: What is the SI derived unit of electrical capacitance?


[Q]: astronomy
[A]:
Caliban is a moon that orbits which planet?