This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Child psychiatry, Subject name: Psychiatry
[{'content': 'In Profound MR, IQ is \nSelect and explain. \nA. 50-69, B. 35-49, C. 20-34, D. < 20', 'role': 'user'}, {'content': 'Answer: D \nExplanation: IQ range for categoriesICD-10DSM-IVMild50-6950-55 to 70Moderate35-4935-40 to 50-55Severe20-3420-25 to 35-40ProfoundBelow 20Below 20-25Reference: Oxford Textbook of Psychiatry; 3rd edition; Chapter 18; Learning Disability', 'role': 'assistant'}]