This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Biostatistics, Subject name: Social & Preventive Medicine
[{'content': 'Which one of the following is not a measure of dispersion - \nSelect and explain. \nA. Mean, B. Range, C. Mean detion, D. Standard detion', 'role': 'user'}, {'content': "Answer: A \nExplanation: The measures of dispersion are; - the range - the mean detion - the standard detion Reference : Park's textbook of preventive and social medicine, 23rd edition, pg no:848", 'role': 'assistant'}]