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': 'Simplest measure of dispersion \nSelect and explain. \nA. Range, B. Standard detion, C. Mean detion, D. Co-efficient of range', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ref:Parks 23rd edition pg 849 Measures of dispersion: Range: simplest measure of dispersion. Mean or Average detion. Standard detion.', 'role': 'assistant'}]