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': 'Which of the following antimicrobial is effective against an organism producing extended spectrum beta lactamase: \nSelect and explain. \nA. Amoxicillin–Clavulanic acid., B. Cefepime, C. Piperacillin-Tazobactam., D. Ceftriaxone.', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]