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
Area under Normal curve with ±1 SD: 
Select and explain. 
A. 0.68, B. 0.17, C. 0.12, D. 0.34
A: 0.68
Answer: A: 0.68 
Explanation: The area under Normal curve with ± 1 SD is 0.68.