<prompt> Select the antimicrobial agent that can be used to treat both methicillin resistant and vancomycin resistant Staphylococcus aureus infections:ClarithromycinClindamycinLinezolidLincomycin  <response>: -Linezolide is effective against MRSA and VRSA infections. -DOC for MRSA is vancomycin. -DOC of VRSA now is daptomycin. 