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 mass spectrometry, the most common fragmentation pattern is the break in α, which cleaves the alkyl bond adjacent to the carbonyl to give: 
 Options:  <0> The corresponding acyl cation and an alkyl radical. <1> The corresponding acyl anion and an alkyl radical. <2> The corresponding acyl radical and an alkyl radical. <3> The corresponding acyl cation and an alkyl cation. <4> The corresponding acyl anion and an alkyl anion.
chemistry

Question: For which disorder is the technique of fading stimulated frequently used? 
 Options:  <0> Enuresis <1> The selective mutism. <2> Childhood asthma <3> Posttraumatic stress disorder secondary to sexual abuse. <4> The encopresis.
psychology

Question: It usually protects the DNA of a restriction enzyme: 
 Options:  <0> Methylation of a nitrogenous base. <1> Glycosylation of a nitrogenous base. <2> Acetylation of deoxyribose. <3> Phosphorylation of deoxyribose. <4> Loss of one of the hydroxyl groups of phosphate.

biology