This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Epidemiology, Subject name: Social & Preventive Medicine
[{'content': 'Spot maps are used for a disease in Epidemiology for depiction of:- \nSelect and explain. \nA. Local distributions, B. Rural-urban variations, C. National variations, D. International variations', 'role': 'user'}, {'content': 'Answer: A \nExplanation: SPOT-MAPS:- Depict geographical/ local distribution of a disease or health condition in a defined place and time. Helps in localizing the source of infection locally in a geographical area. Used by John Snow to localize source of Asiatic Cholera in London. JOHN SNOW - FATHER OF EPIDEMIOLOGY/ Modern epidemiology.', 'role': 'assistant'}]