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.

[EX Q]: 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.
[EX A]: pharmacology

[EX Q]: Question: Olive oil has the following nutrients in its composition, EXCEPT: 
 Options:  <0> Cholesterol. <1> Oleic acid. <2> Antioxidants <3> Vitamin E. <4> Linoleic acid.
[EX A]: nursery

[EX Q]: Question: It gives the plasma membrane high water permeability: 
 Options:  <0> Aquaporins. <1> Ionic channels. <2> Na + / K + -ATPase. <3> Cl / HCO3 exchanger. <4> Its lipid composition.
[EX A]:
biology