Doctor Ken had one vegetative patient. He tried his best to help his patient but it seemed that he could do nothing except waiting for the miracle. One day, he found out that there was the car accident and five persons were severely injure. They needed the organs to transplant as soon as possible. However, five of them were from the family that had the rare blood type. There was no matched organs for them. In that moment of time, the nurse informed Doctor Ken that his vegetative patient had the same blood type with those people and his organs could match to those five persons. According to this, Doctor Ken decided to let his patient dying and brought the organs to transplant to five persons. Which principle does confirm to Doctor Ken’s action?