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 in severe mental retardation - \nSelect and explain. \nA. 50 - 70, B. 35 - 49, C. 20 - 34, D. < 20', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., 20-34 CategoryIQMild50-70Moderate35-49Severe20-34Profound<20", 'role': 'assistant'}]