This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Chemotherapy, Subject name: Pharmacology
[{'content': 'Which of the following drugs is not used for MRSA? \nSelect and explain. \nA. Cefaclor, B. Cotrimoxazole, C. Ciprofloxacin, D. Vancomycin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Cefaclor: It retains significant activity by the oral route and is more active than the first generation compounds against H. influenzae, E. coli and Pr. mirabilis. Other Indications & Uses: Klebsiella spp, Staphylococci, group A beta-hemolytic streptococci ESSENTIALS OF MEDICAL PHARMACOLOGY K.D.TRIPATHI SIXTH EDITION PAGE NO:705', 'role': 'assistant'}]