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
Aztreonam is a/an - 
Select and explain. 
A. beta-lactamase inhibitor, B. beta-lactam antibiotic, C. Antitubercular drug, D. Antifungal drug
B: beta-lactam antibiotic
Answer: B: beta-lactam antibiotic 
Explanation: Ans. is 'b' i.e., beta -lactam antibiotic