This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Communicable diseases, Subject name: Social & Preventive Medicine
[{'content': 'Who is regraded as father of public health? \nSelect and explain. \nA. Louis pasture, B. Cholera, C. John snow, D. Robe Koch', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Cholera which is often called "father of public health " appeared time and again in western world during 19th century Reference; Park&;s Textbook of preventive and social medicine, 24th edition.Pg no.5', 'role': 'assistant'}]