This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Growth, Development, and Behavior, Subject name: Pediatrics
[{'content': 'Birth length is double at the age of \nSelect and explain. \nA. 1 years, B. 2 years, C. 3 years, D. 4 years', 'role': 'user'}, {'content': 'Answer: D \nExplanation: D. i.e. (4 years) (4 Ghai 6th) (6 - Ghai 7th)WeightLength or heightHead circumference*birth - about =3 kg*birth50 cm*Birth34 cm5 month(Doubles)6 kg1 years75 cm1 years45 cm1 years9 kg2years85 cm2years47 cm2 years12 kg3 years95 cm 3 years14 kg4 years(doubles)100 cm3 years49 cm4 years16 kg 4 years50 cm* A useful guide for normal range is target height + 7 cm for girls and target height + 8.5 cm for boys', 'role': 'assistant'}]