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
[{'content': 'In a normal surve, what percent of the values will be included in the area between two standard detions on either side of the mean (x+- ....) ? \nSelect and explain. \nA. 68.3, B. 90.4, C. 95.4, D. 99.7', 'role': 'user'}, {'content': 'Answer: C \nExplanation: <p> 95.4%. Reference:Park&;s textbook of preventive and social medicine,K.Park,23rd edition,page no:849. <\\p>', 'role': 'assistant'}]