Pathology Most common cause of congenital adrenal hyperplasia: Maharashtra 10 A 21-Hydroxylase deficiency B 11-Hydroxylase deficiency C 17-a-Hydroxylase deficiency D 3-P-Hydroxy dehydrogenase deficiency 💡 Explanation Most common cause of congenital adrenal hyperplasia: Maharashtra 10 ✓ Correct Answer: A. 21-Hydroxylase deficiency