You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Epidemiology of cholera in England was classified by- and explain in detail?
Ans. is 'a' i.e., John snow John snow, an English epidemiologist, studied the epidemiology of cholera and estabilished the role of drinking water in the spread of cholera.