This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
Antidiabetic used safely in renal failure 
Select and explain. 
A. Metformin, B. Glimeperide, C. Glibenclamide, D. Rosiglitazone
D: Rosiglitazone
Answer: D: Rosiglitazone 
Explanation: Ans. is 'd' i.e., Rosigtitazone