<prompt> Most common cause of ambigious genitalia in a female child is:Placenta steroid sulfatase deficiencyFetal aromatase deficiencyWnt4 mutationCongenital adrenal hyperplasia  <response>: CAH due to 21 hydroxylase deficiency is the most frequent cause of sexual ambiguity and the MC endocrine cause of neonatal death.Ambiguity of sex at birthCases of ambiguity of sex detected at birth are due to adrenogenital syndrome unless proved otherwise. 