<prompt> In congenital adrenal hyperplasia, deficient enzyme is - most womon-11 hydroxylase deficiency21 a hydroxylase deficiency3a hydroxylase deficiency17a hydroxylase deficiency  <response>: Ans. is b i.e., 21-a Hydroxylase dificiency Congenital adrenal hyperplasia CAHGroup of AR disorderMC adrenal disorder in childhoodMost common 21-hydroxylase deficiencyIn 21a-hyroxylese deficiencyThere is deficiency of mineralocorticoids glucocorticoid.This leads to hypoglycemia, hyponatremia. 