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': 'Mean head circumference at birth is \nSelect and explain. \nA. 48-51 cm, B. 38-40 cm, C. 42-45 cm, D. 33-35 cm', 'role': 'user'}, {'content': "Answer: D \nExplanation: Head circumference:-\n\n\xa0Measured with a nonstretchable tape passing through the maximum point of occipital protuberance posteriorly and at a point just above the glabella anteriorly.\n\nHead circumference must be compared with that of mother to know any familial variations.\nIf the head circumference is more than expected, always measure the both parents' head circumference, for benign familial megalencephaly is common.\nAt birth , it is around 34 cm.HC increases 2cm/ month for the first 3 months, 1cm/month for next three months and 0.5 cm per month for next 6 months.", 'role': 'assistant'}]