The answer is:
Age
This is because if your young your organs are not as developed. When your older your body handles more because it is developed fully.
My guess would be A: Ace.
This model was called GENERAL ADAPTATION SYNDROME [GAS].
Hans Selye proposed the three stages model of GAS, the three stages are alarm, resistance and exhaustion. During the alarm stage, the sympathetic nervous system prepares the body for action. In the resistance stage, the sympathetic nervous system recruits resources that will be needed to maintain high level of activity and energy. In the exhaustion stage,the parasympathetic nervous system takes over and the body experiences physical illnesses.
Answer:La responsabilidad de un médico es que los pacientes se sientan bien.
