A Newborn Presents with Somewhat Ambiguous External Genitalia $\beta$ -Hydroxylase
B) 16

Multiple Choice

A newborn presents with somewhat ambiguous external genitalia. The genitalia appear as an enlarged clitoris and a scrotum-like structure that appears to result from labial fusion. An ultrasound reveals normal ovarian development. The karyotype is 46 XX. The findings are most likely due to a deficiency in which one of the following enzymes?

A) 11 $\beta$ -hydroxylase
B) 16 $\alpha$ -hydroxylase
C) 17 $\alpha$ -hydroxylase
D) 21 $\alpha$ -hydroxylase
E) 3 $\beta$ -hydroxysteroid dehydrogenase