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': 'Aztreonam is a/an - \nSelect and explain. \nA. beta-lactamase inhibitor, B. beta-lactam antibiotic, C. Antitubercular drug, D. Antifungal drug', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., beta -lactam antibiotic", 'role': 'assistant'}]