You will be given a definition of a task first, then some input of the task.
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: Van Deemter's velocity equation tries to justify the contributions of the different effects that cause the widening of the chromatographic band, which are basically of four types:
Options: <0> Eddy diffusion, dead volume and resistance to convection in both phases, mobile and stationary. <1> Length of the chromatographic column, longitudinal diffusion in axial and radical direction, and Joule effect. <2> Kinematic viscosity of the mobile phase, mass transport between the mobile phase and the stationary phase, transversal and longitudinal diffusion. <3> Effect of mass transfer in the stationary phase, in the mobile phase, Eddy diffusion and longitudinal molecular diffusion. <4> Molecular diffusion in axial direction, radical atomic diffusion, internal pressure of the column and viscosity of the mobile phase.
Output:
chemistry