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
Which among the following is not a beta-lactamase inhibitor? 
Select and explain. 
A. Sulbactam, B. Calvulanic acid, C. Piperacillin, D. Tazobactam
C: Piperacillin
Answer: C: Piperacillin 
Explanation: Beta-lactamase inhibitors: Clavulanic acid, Sulbactam, Tazobactam They are potent inhibitors of many bacterial b lactamases and can protect hydrolyzable penicillins from inactivation by these enzymesKatzung 12e 801