What is the main difference between a psychologist and a psychiatrist?

A. A psychiatrist can write prescriptions, but a psychologist cannot.

B. A psychiatrist does not complete a medical degree, but a psychologist does.

C. A psychiatrist works with children and adolescents as clients, and a psychologist works with adults and the elderly as clients.

D. A psychiatrist can only work at a college teaching, and a psychologist can only work at a hospital providing therapy.