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': 'Area falling under 2 S.D. curve would be around - \nSelect and explain. \nA. 66%, B. 95%, C. 57%, D. 99%', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ref: Parks 23rd edition pg 848 The several measures of variation or dispersion of which the following are widely known : RangeThe mean or Average detion The standard detion . Ref:Parks 23rd edition pg 849. 1SD : confidence limit = 68% 2SD : confidence limit = 95% 3SD : confidence limit = 99.7%', 'role': 'assistant'}]