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': 'Ideal desk for school children is \nSelect and explain. \nA. Plus desk, B. Minus desk, C. Zero desk, D. Any of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]