Task: Question Answering
Input (English): Question: The proteasome: 
 Options:  <1> It is formed by 21 homologous subunits organized in 3 rings. <2> It is a protein complex that catalyzes the hydrolysis of ubiquitinated proteins. <3> It is found only in animal eukaryotic cells. <4> Digest acylated proteins. <5> It is activated by a drug, bertezomil, in therapy for multiple myeloma.
Output (English): 2