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: Given three DNA molecules of the same length (A, B and C) and in the same solvent, but with different richness in terms of G + C content (A: 50%, B: 60%, and C: 75% ), How would your melting temperatures (Tm) be ?: 
 Options:  <0> A> B> C. <1> Being in the same solvent, they would be the same in all three cases. <2> The DNA molecule C would not belong to a thermophilic bacterium, given its lower Tm. <3> C> B> A. <4> You can not know with the information of the statement.

A: pharmacology
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Q: Question: The oxygen of the ethers as that of the alcohols can be protonated to generate: 
 Options:  <0> Iminium ion. <1> Alkaloxonium ions. <2> Peroxides <3> Piranos. <4> Enaminas

A: chemistry
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Q: Question: The validation of an analytical method includes: 
 Options:  <0> Validate the analytical process as a whole, validate the range of concentrations in which it is applied and validate the method in each of the matrices to which it will be applied. <1> It only includes validating the range of concentrations in which it is applied. <2> It only includes validating the method in each of the matrices to which it will be applied. <3> It is only necessary to validate the treatment stages of the samples prior to the analytical measurement. <4> It is only necessary to validate the instrumentation by means of suitable calibrations.

A:
chemistry
****