instruction:
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:
Question: The Pearson correlation coefficient: 
 Options:  <0> It is always greater than 1. <1> It is always less than 1. <2> It is between 0 and 1. <3> It is between -1 and 0. <4> It is between -1 and 1.
answer:
chemistry


question:
Question: A parameter of great importance in chromatography is the equivalent height of theoretical plate (H). The van Deemter equation describes the behavior of a filler column for gas-liquid chromatography, where H = A + (B / u) + Cu, so that: 
 Options:  <0> C is the parameter that is taken as a measure of the quality of the filling of the column. <1> A is the coefficient that collects the contribution of longitudinal diffusion. <2> B is the parameter that is related to the resistance to the transfer of matter that opposes the stationary phase. <3> u is the linear velocity of the mobile phase. <4> B is canceled in columns without filling.
answer:
chemistry


question:
Question: Which of the following antitumor agents acts forming a covalent and irreversible complex with the thymidylate synthase and its cofactor, previous activation to the corresponding deoxynucleotide? 
 Options:  <0> Methotrexate <1> Bortezomib. <2> Cyclophosphamide <3> 5-Fluorouracil. <4> Taxol.
answer:

pharmacology