Really though, you can major in anything as long as you meet the degree requirements for your major AND medical school requirements. For instance, I know some people who are pre-med but majoring in psychology. They have to take all their psychology classes PLUS pre-med classes (which usually include general chemistry, general biology, organic chemistry, and biochemistry). This is a pretty ambitious thing to take on.

If you want to be REALLY ambitious, major in something like spanish or another humanities-type major along with fulfilling pre-med requirements. Med-schools will see that you’re well-rounded and will appreciate your hard work.

If you just want to stick to basic science though I would recommend chemistry because you take more advanced math and physics classes than do biology majors and you get more experience in the lab and with writing scientific papers.