This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory System, Subject name: Pharmacology
Treatment of ventilator associated pneumonia (VAP) caused by MDR Acinetobacter baumannii is: 
Select and explain. 
A. Quinupristin and dalfopristin, B. Colistin, C. Lavendamycin, D. Tedizolid
B: Colistin
Answer: B: Colistin 
Explanation: Only 2 forms of polymyxin are in clinical use today- Polymyxin B :- Parenteral, ophthalmic, topical. - Polymyxin E (Colistin):- * Available as prodrug * IV /inhaled nebulizer* Used as salvage therapy for multidrug resistant infection* S/E: - Nephrotoxicity- Neurotoxicity Dalfopristin/Quinuprostin:- Reserved for treatment of severe vancomycin- resistant Enterococcus faecium (VRE) in the absence of other therapeutic options.