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.

[EX Q]: 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.
[EX A]: nursery

[EX Q]: Question: The six-membered cyclic ether with an oxygen atom is called: 
 Options:  <0> Oxolane <1> Oxano <2> Dioxane <3> Oxirano. <4> Oxetano.
[EX A]: chemistry

[EX Q]: Question: Which of the following statements about colchicine is not true? 
 Options:  <0> Depolymerizes tubulin. <1> It can cause nausea and vomiting. <2> It is an uricosuric. <3> It is used in prophylaxis of recurrent attacks of gout. <4> It is an alkaloid.
[EX A]:
pharmacology