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
S.D. is 1.96 the confidence limit is- 
Select and explain. 
A. 63.60%, B. 66.60%, C. 95%, D. 99%
C: 95%
Answer: C: 95% 
Explanation: Ref:Parks 23rd edition pg 849. SD = 1 : confidence limit = 68% SD = 2 : confidence limit = 95% SD = 3 : confidence limit = 99.7% Here , SD= is 1.96, (between 1and 2) So, confidence limit will be between 68% and 95%, but more close to 95%. So answer is 95%