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 is not a beta lactum antibiotic? \nSelect and explain. \nA. Penicillin, B. Carbepenem, C. Monobactum, D. Azithromycin', 'role': 'user'}, {'content': 'Answer: D \nExplanation: These are antibiotics having a beta-lactam ring. The two major groups are penicillins and cephalosporins. Monobactams and carbapenems are relatively newer additions. ESSENTIALS OF MEDICAL PHARMACOLOGY page no.716', 'role': 'assistant'}]