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': 'Point source epidemic tends to - \nSelect and explain. \nA. Continue over one incubation period, B. Produce multiple peaks in the epidemic curve, C. Be explosive, D. Tail gradually', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]