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': 'Treatment of choice for extended spectrum betalactamase producing enterococci \nSelect and explain. \nA. Amoxicillin-clavalunic acid, B. Piperacillin-Tazobactam, C. Ampicillin only, D. Ampicillin + Sulbactam', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. b. Piperacillin-Tazobactam', 'role': 'assistant'}]