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
[{'content': 'Area under Normal curve with ±1 SD: \nSelect and explain. \nA. 0.68, B. 0.17, C. 0.12, D. 0.34', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The area under Normal curve with ± 1 SD is 0.68.', 'role': 'assistant'}]