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.
Input: Question: In what chromatographic mode is the stationary phase formed by solid particles with controlled pore size? :
Options: <0> Chromatography of distribution in normal phase. <1> Distribution chromatography in reverse phase. <2> Ion pair chromatography. <3> Ion exchange chromatography. <4> Chromatography of molecular exclusion or size.
Output:
pharmacology