This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: DNB 2018, Subject name: Pharmacology
Drug active against New Delhi beta lactamase producing strains of bacteria is: 
Select and explain. 
A. Meropenem, B. Colistin, C. Cephalosporins, D. Penicillins
B: Colistin
Answer: B: Colistin 
Explanation: New Delhi Metallo lactamase bacteria are susceptible to colistin. Penicillinase Resistant Penicillin : Cloxacillin Oxacillin Nafcillin Dicloxacillin Ofloxacillin Methicillin Extended Spectrum b Lactamase bacteria are sensitive to carbapenems.