This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Gynaecology & Obstetrics
Ambiguous genitalia in males is due to 
Select and explain. 
A. Congenital adrenal hyperplasia, B. Cushing's disease, C. 5 - alpha reductase deficiency, D. Aromatase deficiency
C: 5 - alpha reductase deficiency
Answer: C: 5 - alpha reductase deficiency 
Explanation: 5 - α Reductase deficiency causes ambiguous genitalia in males. Rest all options cause ambigous genitalia in females.