This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anti Microbial, Subject name: Pharmacology
[{'content': 'Drug of choice for multidrug resistant staphylococcus aureus is: \nSelect and explain. \nA. Clindamicin, B. Streptogramins, C. Vancomycin, D. Aztreonam', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans: c (Vancomycin)Ref: Harrison 16 ed pg. 821, KDT 6 ed. Pg.732Vancomycin is the drug of choice for MRS A. Quinupristin and dalfopristin are both streptogramin antibiotics that act on MRSA and VRSA. They are used mainly for VRSA.Drugs useful against MRSA:Vancomycin Cotrimoxazole Doxycycline Minocycline Fluroquinolones - ciprofloxacin, levofloxacin Linezolid Streptogramins Quinipristine DalfopristineInvestigational Drugs for MRSA:Oritavancin Tigecycline', 'role': 'assistant'}]