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: Medicine
Retardation of skeletal maturity can be caused by all except - 
Select and explain. 
A. Chronic renal failure, B. Hypothyroidism, C. Protein energy malnutrition (PEM), D. Congenital adrenal hyperplasia
D: Congenital adrenal hyperplasia
Answer: D: Congenital adrenal hyperplasia 
Explanation: None