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: For the analysis of traces of inorganic constituents, in samples of organic nature, a preliminary treatment of the sample is needed, which normally consists of: 
 Options:  <0> Dissolve the sample in cold water. <1> Dissolve the sample in hot water. <2> Dissolve the sample between 30 and 70 ºC. <3> Heat the sample between 400 and 700 ºC. <4> Heat the sample in 0.1 M hydrochloric acid.
chemistry

Question: The restriction enzymes hydrolyze bonds: 
 Options:  <0> Phosphodiester <1> Glucosidics <2> Peptides <3> Ionic <4> By hydrogen bridges.
chemistry

Question: In the health diagnosis of a community, if the objective is to know how the environment influences the community, the indicator that must be included in the analysis is: 
 Options:  <0> Unemployment rate. <1> Geographic characteristics. <2> General structure of the population. <3> Fertility rate. <4> Population correctly vaccinated.

nursery