This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Chemotherapy: General Principles, Subject name: Pharmacology
[{'content': 'Extended spectrum beta lactamases (ESBLs) are characterized by activity against all except. \nSelect and explain. \nA. Penicillinases, B. Cephalosporinases, C. Oxyimino-cephalosporinases, D. Carbapenems', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. (D) Carbapenems(Ref: Katzung 10/e p739)Carbapenems like imipenem are the only beta lactams reliably efficacious against ESBL producing bacteria.', 'role': 'assistant'}]