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: The set of means and systems that facilitate the contact of the infectious agent with the recipient subject corresponds to: 
 Options:  <0> Source of infection. <1> Habitat. <2> Transmission mechanism. <3> Biotope <4> Reservoir.
nursery

Question: In the oxaciclohexane-type conformer of sugar -D - (+) - glucopyranose: 
 Options:  <0> One of the OH- groups is axial, but the remaining substituents are equatorial. <1> The CH2OH group is axial but the remaining groups are equatorial. <2> All groups are axial. <3> All groups are equatorial. <4> The CH2OH group is equatorial but the remaining groups are axial.
chemistry

Question: In personality psychology, when talking about consistency and stability of the personality, one can be referring to the observation that: 
 Options:  <0> The features that the person shows are coherent with their ontogenetic history. <1> The behaviors and situations that are equated through the time points are similar. <2> Personality is the response to situational demands. <3> The items that evaluate a trait maintain high correlations with each other. <4> Stable and consistent behaviors are indicators of mental health.

psychology