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.

[Q]: Question: One of the components of injectable formulations are preservatives. This category includes different excipients with different mechanisms of action. Which of the following is used as a chelating agent ?: 
 Options:  <0> Butylhydroxyanisole. <1> Ethylenediaminetetraacetic acid. <2> Ascorbic acid. <3> Propyl gelate <4> Tocopherol.
[A]: pharmacology


[Q]: Question: A 24-year-old boy who, after 3 days of high-risk sexual contact, has numerous pustular, small, very pruritic lesions that progress to minute erosions affecting the entire glans and inner face of the prepuce. Indicate which is, among the following, the most probable diagnostic orientation: 
 Options:  <0> Genital candidiasis <1> Chancroid. <2> Secondary syphilis <3> Balanitis by Trichomonas. <4> Fungal infection by dermatophytes.
[A]: medicine


[Q]: Question: Apoptosis is: 
 Options:  <0> The cellular senescence. <1> A form of programmed cell death. <2> Cell migration <3> A mode of cellular reprogramming. <4> The process of cell differentiation.
[A]:
chemistry