This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Measures of Central Tendency and Distribution, Subject name: Social & Preventive Medicine
[{'content': 'Area between one standard deviation on either side of mean in normal distribution curve is: \nSelect and explain. \nA. 62%, B. 68%, C. 90%, D. 99%', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e. 68% * mean +- 1SD-68.3%* mean +- 2SD-95.4%* mean +- 3SD-99.7%", 'role': 'assistant'}]