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: The fluid of vesicle of chickenpox contains virus during the first 3 days of illness, but scab is no infective.\n\nAbout other options\nOption b\n\nVZV does not grow in an experimental animal or chick embryo.\nIt can be grown in tissue culture cell lines → Human fibroblast, HeLa cells, Vero cells.\n\nOption c\n\nVZV is a DNA virus.\n\nOption d\n\nVZV can cross the placenta and infect the fetus.\nThe baby may develop two types of complications depending on the period of gestation:-', 'role': 'assistant'}]