Major in anything you like, but take all the pre-med curricular requirements and earn the highest grades you can in them. If a particular scientific field appeals to you (e.g. Bioengineering, Neuroscience, et al), then focus on it. If you decide that you do not want to commit to the long academic haul of medical school, then you will have a strong scientific background to draw on. You really can’t lose. You do not need to be an undergraduate Business major to go into investment banking or consulting. In fact, the most elite colleges only introduced undergraduate business majors in the recent past - it was not considered an element of traditional “Arts & Sciences.”