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
Most common cause aof ambigious genitalia in a female child is 
Select and explain. 
A. Placenta steriod sulfatase deficiency, B. Fetal aromatase deficiency, C. Wnt4 mutation, D. Congenital adrenal hyperplasia
D: Congenital adrenal hyperplasia
Answer: D: Congenital adrenal hyperplasia 
Explanation: CONGENITAL ADRENAL HYPERPLASIA

Clinical presentation: Ambiguity of sex detected at birth are due to androgenital syndrome unless proved otherwise. Hirsutism and amenorrhea may be presenting features around puberty in milder form

Diagnosis at birth

An enlarged clitoris
Presence of penile urethra or hypospadius
Hyponatremia,hypakalemia and hypotension
Fusion of labia minora