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
What is the IQ of an imbecile? 
Select and explain. 
A. 70-80, B. 50-69, C. 20-49, D. 0-20
C: 20-49
Answer: C: 20-49 
Explanation: Categorical classification of mental retardationCategory I.Q.Moron50-90Imbecile20-49Idiot<20(Refer: Nelson's Textbook of Pediatrics, SAE, 1st edition, pg no. 51)