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': 'Standard detion is measured in ? \nSelect and explain. \nA. Distribution, B. Dispersion, C. Mean-detion, D. All of the following', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Dispersion", 'role': 'assistant'}]