This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Chemotherapy, Subject name: Pharmacology
Extended spectrum beta lactamases (ESBLs) are characterized by activity against all except: 
Select and explain. 
A. Penicillinases, B. Cephalosporinases, C. Oxyimino-cephalosporinases, D. Carbapenems
D: Carbapenems
Answer: D: Carbapenems 
Explanation: CARBAPENEMS: lmipenem :It is an extremely potent and broad-spectrum Beta-lactam antibiotic whose range of activity includes grampositive cocci, Enterobacteriaceae, Ps. aeruginosa, Listeri.