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: Bortezomib is a proteasome inhibitor approved to treat multiple myeloma. What type of acid group is present in its structure and is necessary for its activity ?: 
 Options:  <1> Boronic. <2> Phosphonic <3> Sulfinic <4> Carb <5> Carboxylic
