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': 'Values are calculated in descending order to calculate: \nSelect and explain. \nA. Mean, B. Median, C. Mode, D. Discrete variable', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Median is calculated only either by arranging in ascending or descending order. In other condition it is not necessary. Ref: Park 21st edition, page 646.', 'role': 'assistant'}]