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 eggs are operculated:
Options: <0> Hymenolepis nana. <1> Trichinella spiralis. <2> Enterobius vermicularis. <3> Fasciola hepatica. <4> Ascaris lumbricoides.
[A]: biology

[Q]: Question: The denaturing of proteins:
Options: <0> Alters the native conformation without affecting the biological activity. <1> It is always irreversible. <2> It can only be achieved by treatment with strong acids. <3> It does not affect the primary structure. <4> It produces the hydrolysis of the protein.
[A]: biology

[Q]: Question: The pyramidal neurons are in:
Options: <0> Cerebellum. <1> Brain. <2> Spinal cord. <3> Spinal ganglia. <4> Hypophysis.
[A]:
biology