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: Within the perceptual distortions we can find: 
 Options:  <0> Hallucinations <1> The metamorphopsias. <2> The eidetic images. <3> Autoscopy (or double phenomena). <4> The parasitic images.
psychology

Question: The cells of the stomach that are responsible for the secretion of hydrochloric acid are: 
 Options:  <0> The main cells. <1> The G cells <2> The parietal cells. <3> The enterocytes. <4> The mucosites of surface.
nursery

Question: A characteristic component of murein or peptidoglycan in most bacterial species is: 
 Options:  <0> The dipicolinic acid. <1> L-glutamic acid <2> The D-alanine. <3> The mannosamine. <4> The diaminoglycoside

biology