Definition: In this task, you are given a multiple-choice question about healthcare. Answer the question based on your information and classify your answers into '1', '2', '3', and '4'.
Input: Question: Dimethyl sulfoxide (DMSO): 
 Options:  <1> It is a protic polar solvent. <2> It is a polar aprotic solvent. <3> It is not a solvent. <4> It is a colorless solid. <5> None of the above.
