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 a population of 200 people with normal distribution. How many people would be included in 1 SD \nSelect and explain. \nA. 136, B. 140, C. 150, D. 190', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. a. 136', 'role': 'assistant'}]