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': 'Middle value of a series of a given data arranged in a ascending or descending order is called \nSelect and explain. \nA. Median, B. Mode, C. Mean, D. Average', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]