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).

concept: Greenwich Mean Time  answers:  ['Codicote', 'Ballincollig', 'Reykjavik', 'Iceland', 'Booterstown', 'WF1 1HS', 'Oxford', 'Halifax', 'Glasgow', 'Harpenden']
what city uses gmt?

concept: Francis H Burnett  answers:  ['The Secret Garden']
what books did frances hodgson burnett wrote?

concept: Isaac Newton  answers:  ["Newton's law of universal gravitation"]

what did newton discover or invent?