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.
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Question: 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.

Answer: biology


Question: Question: A parameter of great importance in chromatography is the equivalent height of theoretical plate (H). The van Deemter equation describes the behavior of a filler column for gas-liquid chromatography, where H = A + (B / u) + Cu, so that: 
 Options:  <0> C is the parameter that is taken as a measure of the quality of the filling of the column. <1> A is the coefficient that collects the contribution of longitudinal diffusion. <2> B is the parameter that is related to the resistance to the transfer of matter that opposes the stationary phase. <3> u is the linear velocity of the mobile phase. <4> B is canceled in columns without filling.

Answer: chemistry


Question: Question: What drugs are useful to stop endogenous hypercortisolism? 
 Options:  <0> Ketokonazol. <1> Methimazole <2> Octreotide. <3> Fludrocortisone <4> Propylthiouracil.

Answer:
medicine