This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anti Microbial, Subject name: Pharmacology
[{'content': 'Which antibiotic acts by inhibiting cell wall synthesis \nSelect and explain. \nA. Cefipime, B. Lomefloxacin, C. Erythromycin, D. Tetracycline', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e. Cefipime", 'role': 'assistant'}]