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': 'All are true about Point source epidemic except \nSelect and explain. \nA. Secondary Waves are not seen, B. All the cases occur simultaneously, C. Plateau is seen, D. None', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]