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
Treatment of choice for extended spectrum betalactamase producing enterococci 
Select and explain. 
A. Amoxicillin-clavalunic acid, B. Piperacillin-Tazobactam, C. Ampicillin only, D. Ampicillin + Sulbactam
B: Piperacillin-Tazobactam
Answer: B: Piperacillin-Tazobactam 
Explanation: Ans. b. Piperacillin-Tazobactam