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: Indicate the amino acid that, under physiological conditions, has an uncharged side chain:
Options: <0> Arginine <1> Aspartic acid. <2> Glutamic acid. <3> Lysine <4> Threonine
A:
chemistry