A clinical psychologist is a C. specialist who studies behavior and emotions, but can't prescribe medication.
A clinical psychologist 1) assesses a patient, 2) diagnose the patients' disorders and, 3) recommend possible treatment.
Possible treatments are undergoing family therapy, group therapy, behavioral therapy, and hypnotherapy. However, when there is a need to prescribe medication to treat a disorder, the patient is referred to another mental health professional, who can prescribe medication.