<prompt> In congenital adrenal hyperplasia, deficient enzyme is - most womon113 hydroxylase deficiency21 a hydroxylase deficiency3a hydroxylase deficiency17a hydroxylase deficiency  <response>: Ans. is b i.e., 21-a Hydroxylase Congenital adrenal hyperplasia CAH Group of AR disorder MC adrenal disorder in childhood Most common 21-hydroxylase deficiency In 21a-hyroxylese deficiency There is deficiency of mineralocoicoids glucocoicoid. This leads to hypoglycemia, hyponatremia 