Teacher: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.
Teacher: Now, understand the problem? Solve this instance: Question: Does not block the flow of electrons in oxidative phosphorylation: 
 Options:  <0> Cyanide. <1> Antimycin A. <2> CO. <3> 2,4-DNP. <4> Amital.
Student:
biology