This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pediatrics
[{'content': 'What is the IQ of an imbecile? \nSelect and explain. \nA. 70-80, B. 50-69, C. 20-49, D. 0-20', 'role': 'user'}, {'content': "Answer: C \nExplanation: Categorical classification of mental retardationCategory I.Q.Moron50-90Imbecile20-49Idiot<20(Refer: Nelson's Textbook of Pediatrics, SAE, 1st edition, pg no. 51)", 'role': 'assistant'}]