This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Growth and development, Subject name: Pediatrics
[{'content': 'A normal healthy child has a height of 100 cm and weighs 16 kg. What is his most likely age_______ \nSelect and explain. \nA. 3 years, B. 4 years, C. 5 years, D. 6 years', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Height doubles by 4 yrs .Since length at bih is 50 cm . Height becomes 100 cm by 4 yrs. Weight =2y +8 = 16 by Weech formula for 1 to 6 yrs. So y =16-8/2 = 8/2=4 yrs Reference: GHAI Essential pediatrics, 8th edition', 'role': 'assistant'}]