Edward Has a Fear of Being Contaminated When Shaking Hands

Edward has a fear of being contaminated when shaking hands with others,touching doorknobs,and being in crowded public spaces,such as subway cars.He washes his hands roughly 100 times a day.His doctor has recently prescribed an antidepressant to increase his level of serotonin.Which approach to psychological disorders does this exemplify?

A) The psychotherapeutic model
B) The medical model
C) The psychological model
D) The self-actualization model