You are given a concept, and a list of answers. You should generate a question about the concept that leads to the given answer(s).

[Q]: concept: Potomac River  answers:  ['Chesapeake Bay']
[A]: where does the potomac river flow into?


[Q]: concept: Soviet Union  answers:  ['Communist state']
[A]: what kind of economy was the soviet union?


[Q]: concept: Johannes Kepler  answers:  ['Mathematician', 'Astronomer', 'Scientist', 'Astrologer']
[A]:
what did johannes kepler accomplish?