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: The translocation t (11; 14) is characteristic of mantle lymphoma. Which fusion protein originates, capable of promoting the cells towards the S phase of the cell cycle ?: 
 Options:  <0> BCL-2 <1> Beta-2-microglobulin. <2> Cyclin D1. <3> Transreticulin. <4> ALK protein.
pharmacology

Question: Isoprene is: 
 Options:  <0> 2-methyl-1,3-butadiene. <1> 2-methyl-2-butene. <2> 2-methyl-1-butene. <3> 2-ethyl-1,3-butadiene. <4> 2-ethyl-2-butene.

chemistry