Dr. Morris is examining his patient, Julie, who is complaining of feeling sick. Without running any tests, Dr. Morris tells Julie that she has the flu, and it will go away on its own. Three weeks later, Julie comes back to Dr. Morris and tells him that she feels worse. Dr. Morris realizes that, in fact, Julie did not have the flu. This is an example of which kind of malpractice?

medication error

surgical error

incorrect diagnosis