This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cell Wall Synthesis Inhibitors, Subject name: Pharmacology
Select the antimicrobial agent that can be used to treat both methicillin resistant and vancomycin resistant Staphylococcus aureus infections: 
Select and explain. 
A. Clarithromycin, B. Clindamycin, C. Linezolid, D. Lincomycin
C: Linezolid
Answer: C: Linezolid 
Explanation: -Linezolide is effective against MRSA and VRSA infections. -DOC for MRSA is vancomycin. -DOC of VRSA now is daptomycin.