Q: 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: Vulcanization is a chemical reaction:
Options: <0> What is done in the forges. <1> Which causes crosslinking of the polymer chains. <2> That desentrecuuza the polymer chains. <3> To prepare composite materials. <4> Which leads to the development of volcanoes.
A:
chemistry