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: Isopropyl alcohol is prepared from petroleum by hydration of: 
 Options:  <0> Isobutene <1> Eteno <2> Penteno <3> Buteno. <4> Propene

A: chemistry
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Q: Question: Which were the first authors who investigated the role that stressful life events could have on health ?: 
 Options:  <0> Mechanic <1> Matarazzo <2> Zola <3> Lazarus <4> Holmes and Rahe.

A: psychology
****
Q: Question: The toxicological interest of the hair is due to: 
 Options:  <0> His analysis allows to know the toxic exposure in the past. <1> The change in their coloration can facilitate the diagnosis of poisoning. <2> It constitutes an effective protective barrier against the action of corrosives. <3> Its growth is interrupted by the chronic consumption of amphetamines. <4> Hair analysis is of no interest in Toxicology.

A:
pharmacology
****