Detailed Instructions: 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.
Q: Question: Liquid chromatography in normal phase:
Options: <0> It uses a column with apolar groups that interact with the apolar part of the analytes differentially. <1> It is a mode of operation that employs a polar stationary phase with a low polarity mobile phase. <2> It uses highly polar mobile phases such as alkanes or chloroalkanes. <3> It is a mode of operation that employs a non-polar surface with a mixed aqueous / organic mobile phase. <4> It uses stationary phases with a large number of hydrophobic alkyl ligands.
A:
chemistry