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: Microbiology
[{'content': 'Congenital varicella infection causes all except: \nSelect and explain. \nA. Macrocephaly, B. Limb hypoplasia, C. Coical atrophy, D. Cicatrix', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. a. Macrocephaly', 'role': 'assistant'}]