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': 'Which of the following is NOT a measure of central tendency? \nSelect and explain. \nA. mean, B. mode, C. range, D. median', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]