Given the task definition and input, reply with output. 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: It is an amino acid whose side chain contains an amine: 
 Options:  <0> Lysine <1> Glutamine <2> Cysteine <3> Serina <4> To the girl.

biology