This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Chemotherapy: General Principles, Subject name: Pharmacology
[{'content': 'Combination of amoxycillin with clavulanic acid is active against all of the following organisms except \nSelect and explain. \nA. MRSA, B. Penicillinase producing Staph, aureus, C. Penicillinase producing N. gonorrhoea, D. Beta lactamase producing E. coli', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (A) MRSA(Ref: GG 1479)Methicillin resistance occurs due to altered penicillin binding proteins, therefore cannot be reversed by b-lactamase inhibitor like clavulanic acid', 'role': 'assistant'}]