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': 'Most common detion used in social medicine is- \nSelect and explain. \nA. Mean, B. Range, C. Variance, D. Standard detion', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. is \'d\' i.e., Standard detion "Standard detion is most common and generally most appropriate measure of dispersion (variation)".', 'role': 'assistant'}]