Pediatrics The most common cause of ambiguous genitalia in a newborn is – A 21 hydroxylase deficinece B 11 β – hydroxylase deficiency C 17 α – hydroxyalse deficiency D 3 β – hydroxysteroid deficiency 💡 Explanation The most common cause of ambiguous genitalia in a newborn is – ✓ Correct Answer: A. 21 hydroxylase deficinece