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 immersion oil used for microscopic observation: 
 Options:  <0> Protects the sample from the oxidizing effect of air. <1> Lubricate the objective lens. <2> Reduces refraction and increases resolution. <3> It acts as a lens that increases magnification. <4> Avoid dehydration of the preparation.
biology

Question: If in an epidemiological study, the participating population has voluntariness as an inclusion criterion, the validity of the results are subject to a bias of: 
 Options:  <0> Information. <1> Confusion. <2> Selection. <3> Interpretation. <4> Publication.
nursery

Question: What model of Family Therapy states that the change occurs when the pathological family game is replaced by another less harmful game? 
 Options:  <0> Therapy of the group of Milan. <1> Palo Alto MRI Therapy. <2> Therapy focused on solutions. <3> Structural therapy <4> Strategic therapy

psychology