This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Virology, Subject name: Microbiology
[{'content': 'Infectivity of chicken pox last for - \nSelect and explain. \nA. Till the last scab falls of, B. 6 days after onset of rash, C. 3 days after onset of rash, D. Till the fever subsides', 'role': 'user'}, {'content': "Answer: B \nExplanation: The incubation period of chickenpox is about 2 weeks. The patient is considered to be infectious during 2 days before and five days after the onset of lesions. REF:ANATHANARAYAN AND PANIKER'S TEXTBOOK OF MICROBIOLOGY 8TH EDITION PAGE NO:471", 'role': 'assistant'}]