Medicine Which is the most common variant of congenital adrenal hyperplasia? A 11b hydroxylase deficiency B 17a hydroxylase deficiency C 3b hydroxyl-steroid dehydrogenase D 21 hydroxylase deficiency 💡 Explanation Which is the most common variant of congenital adrenal hyperplasia? ✓ Correct Answer: D. 21 hydroxylase deficiency