Physiology What is the COMMONEST cause of primary amenorrhea with ambiguous genitalia in a female with 46XX chromosome? A 21 hydroxylase def B 17 hydroxylase def C 11 hydroxylase def D Desmolase hydrolase def 💡 Explanation What is the COMMONEST cause of primary amenorrhea with ambiguous genitalia in a female with 46XX chromosome? ✓ Correct Answer: A. 21 hydroxylase def