John snow, in snow on cholera: a. established postulates for transmission of infectious disease. b. was the father of modern biostatistics. c. was an english anesthesiologist who used natural experiments. d. was a london surgeon who identified an environmental cause of cancer. e. argued that the environment was associated with diseases such as malaria.

(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.

try rubbing alcohol

explanation:

gynecologist i believe