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 drugs that can be used safely in renal failure are: 
Select and explain. 
A. Glimepiride, B. Rosiglitazone, C. Repaglinide, D. All of these
D: All of these
Answer: D: All of these 
Explanation: None