In this task, you are given a question and answer options for that question. Using this information, you have to classify each text into different topics: medicine, nursery, psychology, chemistry, pharmacology, biology.

[Q]: Question: The term that includes the changes of the endometrium during pregnancy is:
Options: <0> Hatching. <1> Apposition. <2> Accession. <3> Invasion. <4> Decidualization.
[A]: biology

[Q]: Question: In relation to classical congenital adrenal hyperplasia indicate the correct answer:
Options: <0> The lack of treatment causes a progressive postnatal virilization. <1> For the diagnosis, a stimulation test with ACTH is necessary. <2> In the male sex, the external genitalia are ambiguous at birth. <3> In the female sex, the external genitalia are normal at birth. <4> Prenatal treatment with glucocorticoids prevents the disease.
[A]: medicine

[Q]: Question: On the link between the nitrogenous base and the ribose of the nucleotides:
Options: <0> The anomeric carbon of ribose is in alpha configuration. <1> It is an N-glycosidic bond. <2> It involves the C5' of the ribose. <3> It involves phosphate groups. <4> It is of a different nature for each nitrogenous base.
[A]:
biology