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': 'Standard deviation does not depend on - \nSelect and explain. \nA. Mean, B. Median, C. Range, D. Sample size', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]