What percentage of healthcare spending is spent on prevention?

According to the ama, what is the key reason behind a physicians' duty of confidentiality to patients? a. the u.s. constitution requires physicians' confidentiality. b. patients will feel more confident in disclosing information to their physicians. c. sharing a patient medical information is a form of defamation. d. if a physician reveals information about a patient, that information isn't admissible in a lawsuit.