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
Spot map is used for - 
Select and explain. 
A. Local distribution of disease, B. Rural urban variation, C. National variation, D. None
A: Local distribution of disease
Answer: A: Local distribution of disease 
Explanation: Studies of the geographical distribution of disease is one of the impoant dimensions of descriptive epidemiology. These variations include International variations, National variations, Rural-urban variation and Local distribution. These variations are best studied with the aid of 'spot maps' or shaded maps. these maps show glance areas of high or low frequency, the boundaries and pattern of disease distribution. Ref: 25th edition, Park's Textbook of Preventive and Social Medicine, Page no. 74