Task: Text Categorization
Input (English): 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.
Output (English): pharmacology