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: 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
chemistry

Question: The number of pairs of metacentric chromosomes of the human karyotype is: 
 Options:  <0> 8 <1> 6 <2> Four. <3> 12 <4> two.
biology

Question: What is the most common course of somatization disorder (DSM-IV-TR)? 
 Options:  <0> It is an acute disease. <1> It is a chronic disease that always remits completely. <2> It is a chronic and fluctuating disease that rarely remits completely. <3> It is very common for a year to pass and the individual suffering from this disorder no longer seek medical help for unexplained somatic symptoms. <4> It is not a fluctuating disease but it is not considered chronic.

psychology