This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anti Microbial, Subject name: Pharmacology
Which of the following is not used in treatment of klebsiella? 
Select and explain. 
A. Ceftazidime, B. Ciprofloxacin, C. Gentamicin, D. Erythromycin
D: Erythromycin
Answer: D: Erythromycin 
Explanation: Ans: d (Erythromycin) Ref: KDT, 6th ed, p. 729, Harrison, p. 883Erythromycin has no action against klebsiellaCarbapenems are the most effective antibiotics against klebsiella.Other drugs effective against klebsiella are:Aminoglycosides,3rd and 4lh generation cephalosporins.FluoroquinolonesAmoxicillin + clavulanic acid combinations.