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: Pharmacology
[{'content': 'Bacitracin acts on - \nSelect and explain. \nA. Cell Wall, B. Cell Membrane, C. Nucleic Acid, D. Ribosome', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Cell wall Bacitracin acts by inhibiting cell wall synthesis. o Bacitracin is a polypeptide antibiotic. o Other polypeptide antibiotics (Polymyxin B, colistin and tyrothricin) act on cell membrane.", 'role': 'assistant'}]