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
A potent inhibitor of beta–lactamase is : 
Select and explain. 
A. Carbenicillin, B. Clavulanic acid, C. Cefamandole, D. Idoxuridine
B: Clavulanic acid
Answer: B: Clavulanic acid 
Explanation: None