Task: Text Categorization
Input (English): Question: Which of the following staining techniques is important in the diagnosis of infections caused by Corynebacterium diphtheriae? 
 Options:  <0> The capsule staining. <1> Staining of metachromatic granules. <2> The acid-alcohol resistance stain. <3> Negative staining <4> The staining of endospores.
Output (English): pharmacology