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
Severe mental retardation is 
Select and explain. 
A. 50 - 69, B. 35 - 49, C. 20 - 34, D. Less than 20
C: 20 - 34
Answer: C: 20 - 34 
Explanation: Mental retardation level IQ range Mild 50-69 Moderate 35-49 Severe 20-34 Profound < 20 (Ref: A sho textbook of psychiatry, Niraj Ahuja,7th edition, pg no 156)