<prompt> Pseudohermaphroditism in a female child is most commonly due to -21 α hydroxylase deficiency17 α hydroxylase deficiency11 β hydroxylase deficiency3 β Hydroxysteroid dehydrogenase deficiency  <response>: Classic 21 α hydroxylase deficiency is the most common cause of Ambiguous genitalia in a new born.Pseudo hermaphroditismA congenital abnormality of the external genitalia and of the body in which one possesses sex glands of one sex but genitals of the opposite sex. 