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: Medicine
Virilisation of the female is present in all, EXCEPT 
Select and explain. 
A. 17-α  hydroxylase deficiency, B. 21-α  hydroxylase deficiency, C. 11-α  hydroxylase deficiency, D. 11-α  hydroxysteroid deficiency
A: 17-α  hydroxylase deficiency
Answer: A: 17-α  hydroxylase deficiency 
Explanation: Congenital adrenal hyperplasia -
Is commonly caused by following 3 enzyme deficiencies 

21 α hydroxylase deficiency (complete)
21 α hydroxylase deficiency (partial)
11 α Hydroxylase deficiency
17 α hydroxylase deficiency

17 α hydroxylase deficiency

Hypertension
No virilization in females (because the gene that codes for 17 α also codes for the enzyme in adrenal cortex).
Primary amenorrhoea and failure of development of secondary sexual characteristic in females.
Male pseudohermaphrodites

21 α hydroxylase deficiency Complete (Salt losing virilizing syndrome) 

Hypotension
Virilization (& Precocious puberty in males)

21α hydroxylase deficiency Partial (Simple virilizing)

Normal B.P.
Virilization (& Precocious puberty in males)

11 β hydroxylase deficiency

Hypertension
Virilization (& Precicous puberty in males)