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: Social & Preventive Medicine
[{'content': 'In a group of 100 children, the mean weight of children is 15 kg. The standard deviation is 1.5 kg. Which one of the following is true? \nSelect and explain. \nA. 95% of all children weight between 12 and 18 kg, B. 95% of all children weight between 13.5- and 16.5kg, C. 99% of all children weight between 12 and 18 kg, D. 99% of all children weight between 13.5 and 16.5kg', 'role': 'user'}, {'content': 'Answer: B \nExplanation: n = 100 children, Mean weight (m) =15 kg, SE = 1.5 kg,\n95% of value are contained in Mean ± 2SD (m ± 2s),\nThus 95% of all children will have weight between 15 + 2 (1.5) i.e. between 12 and 18 kg.', 'role': 'assistant'}]