The correct answer is D.
The Hippocratic oath is an ancient Greek oath and the first explicit expression of medical ethics. It is still a simbolic ritual for many novel doctors nowadays. It involves promises made by new doctors, for instance, related to confidentiality with the patients (hence, excluding option A) and to the principle of non-maleficence.
This principle of non-maleficence states that it is preferable not to harm the patient to a greater extent, than to do good to him/her. This is established as a barrier to prevent enthusiastic doctors from using treatments only because of trusting on their knowledge and on hunches, without waiting for enough evidence to support their decisions. This is why they can only treat symptoms.
Answer:
Native American populations declined rapidly due to a lack of immunity to disease
Explanation:
At that time, many Europeans who came to American continent carried out viruses that could cause diseases such as smallpox, influenza, and measles within their body.
When they "Encountered" The native Americans, these viruses passed on to the Natives and infected them.
Because the natives have lack of immunity to disease (they never experienced diseases like that in their life) , the effect to their body is much greater compared to the Europeans. This led to large amount of death among Native Americans.
C. I know the answer because I’m part Jewish