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: Dental
[{'content': 'If the mean cholesterol value of a group of normal subjects is 230mg% with standard error of 10. The 95% confidence limits for the population: \nSelect and explain. \nA. 220 & 240, B. 210 & 250, C. 200 & 260, D. 210 & 240', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]