This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteriology, Subject name: Anatomy
Which drug resistance differentiates the non fermenters, Psedomonas and burkholderia? 
Select and explain. 
A. Resistance to ampicillin, B. Resistance to ceftazidime, C. Resistance to ciprofloxacin, D. Resistance to polymyxin B
D: Resistance to polymyxin B
Answer: D: Resistance to polymyxin B 
Explanation: Burkholderia can be differentiated from Pseudomonas by it's resistance to polymyxin, As polymyxin B is used for treating Psedomonas infection