<prompt> Retardation of skeletal maturity can be caused by all except-Chronic renal failureHypothyroidismProtein energy malnutrition PEMCongenital adrenal hyperplasia  <response>: 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 17e p2208 