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
[{'content': 'True about point source epidemic are all except ? \nSelect and explain. \nA. The curve has rapid rise and slow decline, B. All cases occur in one incubation period, C. One single peak only, D. No secondary curves', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., The curve has a rapid rise and slow decline Epidemic curve of point source epidemic has - Rapid rise Rapid fall No secondary wave", 'role': 'assistant'}]