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: Which of the following statements about the steady-state infusion of a drug is true? 
 Options:  <0> The concentration reached in steady state of equilibrium depends exclusively on the clearance. <1> The time necessary to reach the steady state of equilibrium depends on the volume of distribution. <2> The concentration reached in a steady state depends exclusively on the elimination half-life. <3> The concentration achieved in the steady state equilibrium depends on the clearance and the infusion rate. <4> The time required to reach the steady state of equilibrium depends on the clearance.
[A]: pharmacology


[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 Purkinje cells of the cerebellum receive direct input from: 
 Options:  <0> Spinal neurons <1> Neurons of deep cerebellar nuclei. <2> Climbing fibers <3> Mossy fibers. <4> Pyramidal neurons of cerebral cortex.
[A]:
biology