This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Time Distribution, Epidemics, Subject name: Social & Preventive Medicine
[{'content': 'Food poisoning is an example of: \nSelect and explain. \nA. Point source epidemic, B. Propagated source epidemic, C. Common source epidemic, D. Pandemic', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 1. Point source epidemic ( single exposure ) Sudden rise sudden fall. Cluster of cases in single IP. All cases develop within one incubation period of the disease E.g. Food poisoning , Bhopal gas tragedy. 2. Common source , continuous or repeated exposure epidemics Sharp rise Fall is interrupted by secondary peaks Eg. Contaminated well in a village,Water Borne Cholera. 3. Propagated source epidemic Gradual rise & gradual fall over long time. Person to person transmission E.g:- HEP. A, POLIO.', 'role': 'assistant'}]