This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Staphylococci, Subject name: Microbiology
[{'content': 'Drugs indicated in MRS A infection are all EXCEPT: \nSelect and explain. \nA. Vancomycin, B. Teicoplanin, C. Linezolid, D. Imipenem', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. (d) ImipenemRef: Harrisons 19th ed.* Microbes which are resistant to methicillin are said to be MRSA.* Methicillin is highly penicilinase resistant but not acid resistant.* MRSA have emerged in many areas. These are insensitive to all penicillinase-resistant penicillins and to other b -lactams as well as to erythromycin, aminoglycosides, tetracylines, etc.* The drug of choice for these organisms is vanocomycin/ linezolid, but ciprofloxacin and Rifampicin can also be used.* IMIPENEM is an extremely potent and broad-spectrum b-lactam antibiotic whose range of activity includes grampositive cocci, Enterobacteriaceae, Ps. Aeruginosa, Listeria as well as anaerobes like Bad. Fragilis and Cl. Difficile.* It is resistant to most b-lactamases; inhibits penicilinase producing staphylococci and some MRSA', 'role': 'assistant'}]