The Main Difference Between a Psychiatrist and a Psychologist Is

The main difference between a psychiatrist and a psychologist is that:

A) a psychiatrist is usually a psychoanalyst, while a psychologist is usually a behaviorist.
B) a psychologist is a medical doctor, while a psychiatrist is a researcher who studies illnesses.
C) a psychiatrist is a medical doctor who can provide therapy, while a psychologist is not a medical doctor but can provide therapy.
D) a psychiatrist works exclusively in hospitals, while a psychologist works exclusively in mental health clinics.