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: Social & Preventive Medicine
An IQ between 50 & 70 would be classified as what kind mental retardation – 
Select and explain. 
A. Mild, B. Moderate, C. Severe, D. Borderline
A: Mild
Answer: A: Mild 
Explanation: The WHO classification of mental retardation is based on the concept of IQ and includes the following categories: