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': 'Incubatory carrier seen in - \nSelect and explain. \nA. Cholera, B. Bubonic plague, C. Mumps, D. Measles', 'role': 'user'}, {'content': "Answer: C \nExplanation: Period of communicability of mumps : Usually 4-6 days before the onset of symptoms and a week or more thereafter. The period of maximum infectivity is just before and at the onset of parotitis. Ref: 25th edition, Park's Textbook of Preventive and Social Medicine, Page no. 165", 'role': 'assistant'}]