Task: Question Answering
Input (English): Question: In relation to classical congenital adrenal hyperplasia indicate the correct answer: 
 Options:  <1> The lack of treatment causes a progressive postnatal virilization. <2> For the diagnosis, a stimulation test with ACTH is necessary. <3> In the male sex, the external genitalia are ambiguous at birth. <4> In the female sex, the external genitalia are normal at birth. <5> Prenatal treatment with glucocorticoids prevents the disease.
Output (English): 1