premise: A study sponsored by a consumer group tests exactly five of seven cold medications—F, G, H, I, K, L, and M—and ranks the medications tested from first (best) to fifth (worst). There are no ties. The following conditions must apply: L ranks second. Either F or G ranks first. I is tested. H ranks better than G if both are tested. K ranks better than F if both are tested. If M is tested, both F and H are also tested. Which one of the following cold medications must be among those tested in the study?
hypothesis: M