instruction:
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:
Question: With respect to the peptide bond, indicate which of the following statements is FALSE: 
 Options:  <0> It has partial character of double bond. <1> Form a small dipole. <2> Its formation involves the elimination of a molecule of water. <3> The peptide chain rotates freely through the peptide bond. <4> In an amide link.
answer:
chemistry


question:
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.
answer:
biology


question:
Question: In the Th2-B cooperation process, what does the Th2 cell recognize on the surface of the B cell? 
 Options:  <0> The antigen bound to a surface immunoglobulin. <1> A fragment of antigen bound to the CD21 molecule. <2> Several cross-linked antigen fragments. <3> A fragment of antigen bound to a class II histocompatibility molecule. <4> A fragment of antigen bound to a class I histocompatibility molecule.
answer:

pharmacology