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': 'One standard detion in normal standard curve includes value- \nSelect and explain. \nA. 50%, B. 68%, C. 95%, D. 100%', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., 68% o 1 SD includes ----> 68% of values o 2 SD includes ----> 95% of values o 3 SD includes ----> 99.7% of values", 'role': 'assistant'}]