Most pre-medical students take psychology, biology, chemistry or something science-related, in addition to the classes needed as prerequisites for medical school, for their undergraduate degree or even for a master's, but is there any particular degree besides an MD that someone who wants to be a psychiatrist needs to take?
For example, is a business, philosophy, english or political science major who has taken the required classes of medical school who later finishes medical school eligible to train to become a psychiatrist? I'm curious as to how such a person would get the psychology-related training and knowledge. Is it in the training after medical school? Is it related to medical school electives?