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': 'Weight of a child triples at: September 2005 \nSelect and explain. \nA. 6 months, B. 1 year, C. 18 months, D. 2 year', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B: 1 year Normal Weight Increase: Weight doubles by 6 months of age Weight triples by 1 year of age Weight quadruples by 2 years of age Annual increase (Ages 2-9): 2.0 kg/year', 'role': 'assistant'}]