<prompt> Which of the following is the least common cause of ambiguous genitalia in a female child?Fetal placental steroid sulfatase deficiencyFetal placental aromatase deficiencyCongenital adrenal hyperplasiaWNT-4 gene mutation  <response>: Fetal placental steroid sulfatase deficiency is an X-linked disorder therefore occur only in males. So its the least common cause of ambiguous genitalia in a female child. Ref: Principles and practice of endocrinology and metabolism, Page 957 By Kenneth L. Becker page1061. 