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
In a normal curve, the area of one standard detion around the mean includes which of the following per cent of values in a distribution - 
Select and explain. 
A. 48.60%, B. 68.30%, C. 95.40%, D. 99.70%
B: 68.30%
Answer: B: 68.30% 
Explanation: Ans. is 'b' i.e., 68.3%