This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Social Science, Mental Health & Genetics, Subject name: Social & Preventive Medicine
[{'content': 'IQ = 35-47; classified according to WHO is \nSelect and explain. \nA. Mild mental retardation, B. Moderate mental retardation, C. Severe mental retardation, D. Profound mental retardation', 'role': 'user'}, {'content': 'Answer: B \nExplanation: (Moderate mental retardation) (502- Park 2(fh)WHO gave the following classification of mental retardationMild mental retardationIQ = 50-70Moderate mental retardationIQ = 35-49Severe mental retardationIQ = 20-34Profound mental retardationIQ = Under 20.', 'role': 'assistant'}]