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': 'A newborn baby has a head circumference of 35 ems. at bih, His optimal head circumference will be 43 ems at - \nSelect and explain. \nA. 4 months of age, B. 6 months of age, C. 8 months of age, D. 12 months of age', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., 6 months of age o At 6 month of age head circumference is between 40.0-43.5cm.", 'role': 'assistant'}]