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.

Question: In the valuation of a strong base with a strong acid the pH of the equivalence point: 
 Options:  <0> It depends on the strong base that is valued. <1> It is determined by the excess OH ̄ of the solution. <2> It depends on the strong acid used as a titrant. <3> It is determined by the dissociation of water. <4> It is determined by the excess H + of the solution.
chemistry

Question: The reaction conditions for transforming nonanamide into octanamine and carbon dioxide are: 
 Options:  <0> H2, metallic catalyst. <1> Excess of CH3I, K2 CO3. <2> Cl2, NaOH, H2O. <3> LiAlH4, diethyl ether and then hydrolysis. <4> CH2N2, diethyl ether.
chemistry

Question: Azidothymidine (AZT) used against the human immunodeficiency virus: 
 Options:  <0> It binds to the cellular RNA polymerase and blocks transcription. <1> It binds to the early promoter of the virus and prevents its recognition by RNA polymerase. <2> Antagonizes the phosphorylation of nucleosides, thus inhibiting the synthesis of viral DNA. <3> Blocks the transport of thymidine to the cellular interior. <4> Inhibits transcriptase

biology