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': 'In case of normal curve, the limits mean +/- 2SD cover: \nSelect and explain. \nA. 66%, B. 78%, C. 95%, D. 99%', 'role': 'user'}, {'content': 'Answer: C \nExplanation: 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', 'role': 'assistant'}]