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: Pediatrics
Pseudohermaphroditism in a female child is most commonly due to- 
Select and explain. 
A. 21-hydroxylase deficiency, B. 17-hydroxylase deficiency, C. 11-hydroxylase deficiency, D. 3-hydroxylase deficiency
A: 21-hydroxylase deficiency
Answer: A: 21-hydroxylase deficiency 
Explanation: Ans. is 'a' Le., 21-hydroxylase deficiency Classic 21-hydroxylase deficiency is the most common cause of Ambiguous genitalia in a new born. Virilization is usually apparent at bih in females Le Pseudohermaphroditism of a female child