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: Why do ovarian cycles not appear in nursing mothers for several months after birth ?: 
 Options:  <0> For stress and lack of sleep associated with breastfeeding. <1> Because there are low levels of FSH and LH. <2> Because there are high levels of oxytocin. <3> By saving iron that is derived from breastfeeding. <4> Because there are high levels of progesterone.
pharmacology

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: In which personality disorder can the individual have unfounded and recurrent suspicions about the fidelity of the couple, as well as having doubts about the loyalty or honesty of the friends or acquaintances ?: 
 Options:  <0> In the celotypic personality disorder. <1> In delusional personality disorder. <2> In the dependent personality disorder. <3> In the paranoid personality disorder. <4> In narcissistic personality disorder.

psychology