<prompt> Most common cause of ambiguous genitalia in a female child is:Placenta steroid sulfatase deficiencyFetal aromatase deficiencyWnt4 mutationCongenital adrenal hyperplasia  <response>: Ans. is d, i.e. Congenital adrenal hyperplasiaRef Leon Speroff 8 thed, p349; Dutta Gyne 6thed, p440CAH due to 21 hydroxylase deficiency is the most frequent cause of sexual ambiguity and the MC endocrine cause of neonatal death. - Ref: Leon Speroff 8thed, p349Ambiguity of sex at birth -- Cases of ambiguity of sex detected at birth are due to adrenogenital syndrome unless proved otherwise. - Ref: Dutta Gynae 6thed, p404 