A 55-year-old man has a 3-month history of chest pain and fainting spells. You feel his symptoms merit cardiac catheterization. You explain the risks and potential benefits to him, and include your assessment of his likely prognosis without the intervention. He is able to demonstrate that he understands all of this, but refuses the intervention. Can the refuse the intervention, legally?
A．No, because the patient does not comprehend the severity of his
cardiovascular condition.
B． No, because the patient has a documented life threatening cardiac
condition.
C． Yes, because he is competent to make this decision, and the doctor
has a duty to respect his choice.
D． The doctor can perform the cardiac catheterization after obtaining a
court order.
（ ）.