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 measure of dispersion- \nSelect and explain. \nA. Range, B. Mean detion, C. Median, D. Standard detion', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ref:Parks 23rd edition pg 848 Measures of dispersion: Range: simplest measure . Mean or average detion. Standard detion : most frequently used .', 'role': 'assistant'}]