Q: 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: The alkaline error in the glass electrode is due to
Options: <0> The membrane responds to other anions besides the hydroxyl ion. <1> The membrane responds to other anions besides the hydrogen ion. <2> The membrane responds to other cations in addition to the hydrogen ion. <3> That the pH is higher than it really is. <4> This error is not described for the glass electrode.
A:
pharmacology