Congenital Adrenal Hyperplasia is due to deficiency of:: (A) 21 beta hydroxylase, (B) 17 alpha hydroxylase, (C) 5 alpha reductase, (D) 17 beta reductase
Answer is A. a. 21 beta hydroxylase(Ref: Nelson's 20/e p 2714-2723, Ghai 8/e p 526-527)Most common cause of Congenital Adrenal Hyperplasia is 21 beta hydroxylase deficiency.