<prompt> Pseudohermaphroditism in a female child is most commonly due to21hydroxylase deficiency17hydroxylase deficiency11hydroxylase deficiency3hydroxylase deficiency  <response>: Classic 21-hydroxylase deficiency is the most common cause of Ambiguous genitalia in a newborn.Virilization is usually apparent at birth in females i.e Pseudohermaphroditism of a female child. 