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: In a patient with Renal Insufficiency, oral drugs must be administered: 
 Options:  <0> With natural fruit juices. <1> With the lowest volume of liquid possible. <2> With the same volume as any other patient. <3> With the largest volume of liquid possible. <4> Always during hemodialysis.

A: nursery
****
Q: 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.

A: biology
****
Q: Question: The microbiocidal action of iodine and chlorine and many of its derivatives is due to: 
 Options:  <0> They are oxidizing agents. <1> They bind specifically to the active centers of the enzymes. <2> They bind specifically to ribosomal proteins. <3> They induce pores in the membranes. <4> They cause the dissolution of membrane phospholipids.

A:
biology
****