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
A 10 year old child has mental age of 4 years. He is:- 
Select and explain. 
A. Idiot, B. Imbecile, C. Moron, D. Normal
B: Imbecile
Answer: B: Imbecile 
Explanation: IQ level = mental age/ chronological age X 100 - IQ (intelligence quotient) = Mental age / Chronological age X 10 Term IQ range Moron 51- 70 Imbecile 26 - 50 Idiot 0 - 25