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 reaction conditions for the preparation of 2-methyl-2-methoxypropan-1-ol from 2,2-dimethyloxirane are: 
 Options:  <0> Methanol in acid medium. <1> Lithium aluminum hydride in methanol. <2> Methylmagnesium bromide and subsequent hydrolysis. <3> Sodium methoxide in methanol. <4> Triphenylphosphine in methanol.

Answer: chemistry


Question: Question: Form B of DNA: 
 Options:  <0> It is formed by a double helix levorotatory with two antiparallel nucleotide chains. <1> It is wider and longer than form A. <2> It has pairs of nitrogenous bases perpendicular to the axis of the helix. <3> Corresponds to dehydrated DNA. <4> It is the minority form presented by DNA under physiological conditions.

Answer: chemistry


Question: Question: Comparing the redox behavior of the silver and sodium systems: 
 Options:  <0> Na + is a good oxidant, because its system has a high reduction potential. <1> Ag is an excellent oxidant, so it does not rust in the air. <2> Ag + is a good oxidant, and therefore easily reducible to metal. <3> The two metals dissolve in acid medium releasing H2 <4> The two metals dismute spontaneously in water.

Answer:
chemistry