This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteria, Subject name: Microbiology
[{'content': 'A diabetic patient developed cellulite is due to S. aureus, which was found to be methicillin resistant on the antibiotic sensitivity testing. All of the following antibiotics will be appropriate except: \nSelect and explain. \nA. Vancomycin, B. Imipenem, C. Teicoplanin, D. Linezolid', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. is \'b\' i.e., Imipenem(Ref: Harrison, 18th/e, p. 1168 and 17th/e, p. 879)"The carbapenem imipenem has excellent activity against methicillin - sensitive S. aureus but not M.R.S.A." Because MRSA is resistant to all Beta-lactam antibiotics including cephalosporins and carbapenems.', 'role': 'assistant'}]