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
In a child with profound mental retardation, what is the IQ? 
Select and explain. 
A. 20-34, B. 35-49, C. 50-69, D. <20
D: <20
Answer: D: <20 
Explanation: Ans. D.<20Level of intelligenceIQProfound MR<20Severe MR20-34Moderate MR35-49Mild MR50-69Borderline70-79Low normal80-89Normal90-108Superior109-119Very superior120-139Near genius>140IQ-<70 - Mental retardation50-70- Mild MR - educable up to 6th class35-49 - Moderate MR - trainable (study up to 2nd class)20-34- Severe MR - specialized care<20 - Profound MR - chronic rehabilitation