This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Psychiatry
Patient with IQ of 60 has - 
Select and explain. 
A. Mild mental retardation, B. Moderate M..R, C. Severe M.R., D. Profound M.R.
A: Mild mental retardation
Answer: A: Mild mental retardation 
Explanation: None