instruction:
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.
question:
architecture
answer:
Who designed the Bridgewater Canal, opened in 1761?


question:
spaceflight
answer:
What was visited by Viking, Pathfinder, and Curiosity?


question:
freebase
answer:

The becquerel (Bq) is a unit of measurement of what?