This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
[{'content': 'A diabetic patient developed cellulitis due to staphylococcus aureus, which was found to be Methicillin resistant on the antibiotic sensitivity testing. All the following antibiotics will be appropriate except- \nSelect and explain. \nA. Vancomycin, B. Imipenem, C. Teichoplanin, D. Linezolid', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. is \'b\' i.e., Imipenem "The carbapenem imipenem has excellent activity against methicillin-sensitive S.aureus but not MRSA." MRSA is resistant to all beta-lactam antibiotics because resistance develops due to alteration in transpeptidase (penicillin binding protein) on which all beta-lactam antibiotics act. Drugs for MRSA --> Vancomycin (DOC), Ciprofloxacin Quinopristin/dalfopristin Tigecyclin TMP-SMX Linezolid Daptomycin Teicoplanin Minocyclin Levofloxacin Oritavaccin Cotrimoxazole', 'role': 'assistant'}]