Answer: (C) Was an English anesthesiologist who used natural experiments.
Explanation:
John snow was an English anesthesiologist and he accomplishment in the anesthesia, medicine and in the epidemiology.
Dr john snow set up the series for using the natural experiments. He is also known as the father of the modern epidemiology.
He basically believe that the sewage dump into the rivers near the town can cause the cholera outbreak. In 1854, he investigated the reason of out break and also proves his theory in the Soho, London. He also leader of the development of the medical hygiene and the anesthesia.
One mechanism could be educating people about HIV/AIDS from mouth to mouth, another would be to make long lectures which would educate people about this disease, another would be to make workshops which would serve the same role.
neutropenia is the lack of white blood cells.
