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: Medicine
[{'content': 'The antibiotic which acts by interfering with addition of new cell wall subunits (Muramyl pentapeptides) is: \nSelect and explain. \nA. Bacitracin, B. Penicillins, C. Vancomycin, D. Mupirocin', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Vancomycin, penicillin and bacitracin acts by inhibiting cell wall synthesis. Ref: Harrisons, Edition-18, Page : 1134.', 'role': 'assistant'}]