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': 'Regarding point source epidemic, false statement (s) is/are: \nSelect and explain. \nA. Rapid rise & fall, B. Only infection disease can cause, C. Explosive, D. Cases occur even after incubation period', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Common source single exposure epidemics Disease agent is brief and essentially simultaneous, resultant cases all develop within one weak of the incubation period. (refer pg no:64 park text 23rd edition)', 'role': 'assistant'}]