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: Pediatrics
[{'content': "Child (girl) is suffering from varicella (fever rash). And child\\'s aunt is pregnant. When is it earliest that the child can meet her aunt – \nSelect and explain. \nA. When the lesions have crusted, B. Immediately, C. Anytime as the child is aunt's favourite, D. After the delivery of the baby", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Varicella Zoster (chicken pox) is a highly contagious disease, a centripetal, pleomorphic rash appearing on the first day of the illness and a relatively short course of illness.\nThe crusts from chicken pox lesions don’t contain viable virus and are therefore not infective. Period of infectivity range from a day prior to the illness and up to 5 days after the onset. Children with chickenpox are removed from school or daycare centres for 6 days after the appearance of the rash.', 'role': 'assistant'}]