This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Social & Preventive Medicine
Epidemiology of cholera in England was classified by- 
Select and explain. 
A. John Snow, B. Winslow, C. Chadwick, D. Howard huger
A: John Snow
Answer: A: John Snow 
Explanation: 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.