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: Dental
According to Stanford-Binet test, non trainable type of
mental retardation has an IQ of: 
Select and explain. 
A. Below 20, B. Between 36-51, C. Above 51, D. Between 90 - 130
A: Below 20
Answer: A: Below 20 
Explanation: None