This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, 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: Ans is option 4 .. Congenital adrenal hyperplasia Delay in bone age is seen in - Nutritional dwarfism Hypopituitarism Hypothyroidism Renal failure In congenital adrenal hyperplasia increase in the level of sex hormones accelerates bone maturation. Ref Harrison 17/e p2208