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: Potentiometric titration of chloride with a silver electrode, using a silver ion standard solution:
Options: <0> It is based on the formation of silver complexes in the presence of a high concentration of chloride. <1> Follow the Nernst equation, in which the variation of the potential varies linearly with the concentration of silver ion. <2> It shows an equivalence point where pAg does not depend on the chloride concentration. <3> It gives rise to potential variations that depend on the amount of AgCl formed. <4> It provides a titration curve in which the jump of pAg does not depend on the concentration of chloride.
Output:
chemistry