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: Microbiology
[{'content': 'True about methicillin-resistant Staphylococcus aureus (MRSA) is \nSelect and explain. \nA. Isoxazolyl penicillin is highly effective, B. All MRSA are multidrug resistance, C. Vancomycin is effective, D. MRSA are more virulent than sensitive strains', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Penicillin resistance may also be due to alterations in penicillin-binding protein PBP2a and changes in bacterial surface receptors, reducing binding of beta-lactam antibiotics to cells. This resistance also extend to cover beta lactamase\xa0resistant penicillin such as methicillin and cloxacillin(MRSA)\nSome of these strains may show resistance to other antibiotics like erythromycin, tetracyclines, aminoglycosides and heavy metals.', 'role': 'assistant'}]