This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
[{'content': 'Weight of newborn doubles by what age ? \nSelect and explain. \nA. 6 months, B. 1 year, C. 2 years, D. 4 years', 'role': 'user'}, {'content': 'Answer: A \nExplanation: O.P. Ghai 9th edition - page 13. "An infant usually doubles his bih weight at the age of 5 months. The bih weight triples at 1 year and is 4 times at the age of 2 years. Thus, the weight at 5 months, 1 year and 2 years is 6, 9 and 12 kgs, respectively."', 'role': 'assistant'}]