Extended-spectrum beta-lactamases (ESBLs) are characterized by activity against all except :: (A) Penicillinases, (B) Cephalosporinases, (C) Oxyimino–cephalosporinases, (D) Carbapenems
Answer is D. Carbapenems like imipenem are the only beta-lactams reliably efficacious against ESBL producing bacteria.