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: Dental
[{'content': 'Measures of dispersion variability: \nSelect and explain. \nA. Variance, B. Standard deviation, C. Range, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Measures of dispersion variability:\n\nVariance\nStandard deviation\nRange\nInterquartile range', 'role': 'assistant'}]