This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Pediatrics
Male pseudohermaphroditism is seen in 
Select and explain. 
A. 5- a redutase deficiency, B. 21 hydroxylase deficiency, C. 17 hydroxylase deficiency, D. Gonadal dysgenesis
A: 5- a redutase deficiency
Answer: A: 5- a redutase deficiency 
Explanation: 5 alpha reductase conve testosterone to dihydrotestosterone,which is required for external genital devolopment in male.deficiency of it leads to development of mullerian duct into fallopian tube,Uterus and upper third of vagina. Reference : Ghai essential of pediatrics, eighth edition, p.no:538