This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Biostatistics, Subject name: Social & Preventive Medicine
[{'content': 'In a normal curve, the area of one standard detion around the mean includes which of the following percent of values in a distribution- \nSelect and explain. \nA. 48.60%, B. 68.30%, C. 95.40%, D. 99.70%', 'role': 'user'}, {'content': "Answer: B \nExplanation: - the area of either side of mean in normal distribution curve gives the confidence limit. - confidence limit is calculated from mean and standard detion. - In a normal curve, the area of one standard detion around the mean includes 68 percent of values in a distribution approximately. Reference : Park's textbook of preventive and social medicine, 23rd edition, pg no:849", 'role': 'assistant'}]