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 birth height at the age of – \nSelect and explain. \nA. 1 year, B. 2 years, C. 4 years, D. 6 years', 'role': 'user'}, {'content': 'Answer: C \nExplanation: An infant usually doubles his birth height by the age of 41/2 years', 'role': 'assistant'}]