Which of the Following Statements Is True About the Physician-Patient

Which of the following statements is true about the physician-patient privilege?

A) The privilege belongs to the patient.
B) The doctor cannot assert the privilege at trial if the patient is not present at the trial.
C) If the patient waives the privilege, the physician can exercise the privilege and cannot be compelled to testify.
D) The privilege applies when an outside, nonessential third party is present during the conversation with the doctor.