Teacher:In this task, you are given a multiple-choice question about healthcare. Answer the question based on your information and classify your answers into '1', '2', '3', and '4'.
Teacher: Now, understand the problem? Solve this instance: 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.
Student:
1