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: An essential characteristic of plasmids is: 
 Options:  <0> Be able to integrate into the genome of the host cell. <1> Direct the process of bacterial conjugation. <2> Carry genes for antibiotic resistance. <3> Replicate autonomously. <4> Being circular DNA molecules.

A: biology
****
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: Dense neat or patterned connective tissue is part of: 
 Options:  <0> Hemopoietic stroma. <1> Tendons <2> Digestive mucosa <3> Mucosa of the uterus. <4> Sclera

A:
biology
****