This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Gynaecology & Obstetrics
A 13yr old child visits gynaec OPD with complaints of not attaining menarche with karyotype 46XX On examination there is cliteromegaly what enzyme likely to be deficient in the above condition 
Select and explain. 
A. 21 alpha hydroxylase, B. 11 beta hydroxylase, C. 17 alpha hydroxylase, D. 3 beta hydroxysteroid dehydrogenase
A: 21 alpha hydroxylase
Answer: A: 21 alpha hydroxylase 
Explanation: ref : gynecology shaw