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': 'The height of a child is double the bih height 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 years o An infant usually doubles his bih height by the age of 41/2 years Age Bih 3 months 9 months 1 year 2 years 41/2 years Height 50 cm 60 cm 70 cm 75 cm 90 cm 100 cm", 'role': 'assistant'}]