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': 'Bih weight of a child doubles at five months of age while the bih length doubles at the age of - \nSelect and explain. \nA. 1 year, B. 2 years, C. 3 years, D. 4 years', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., 4 year", 'role': 'assistant'}]