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': 'Which of the following is true of chicken pox ? \nSelect and explain. \nA. Virus not found in scab, B. Virus can be grown on the chick embryo, C. Caused by RNA virus, D. Does not cross the placental barrier', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Virus not found in scab The fluid of vesicle of chickenpox contains virus during first 3 days of illness, but scab is noninfective. About other options Option b VZV does not grow in experimental animal or chick embryo. It can be grown in tissue culture cell lines ---> Human fibroblast, hela cells, vero cells. o Option c VZV is a DNA virus. o Option d VZV can cross placenta and infect the fetus.", 'role': 'assistant'}]