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 case of normal curve, the limits mean +/- 2SD cover: 
Select and explain. 
A. 66%, B. 78%, C. 95%, D. 99%
C: 95%
Answer: C: 95% 
Explanation: In case of normal curve, the limits mean +/- 2SD cover 95% of subjects, while mean +/- 3 SD covers 99.7% subjects. Ref: Medical biostatistics, 1st edition pg: 180