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
Which of the following does not cause hypoglycemia ? 
Select and explain. 
A. Insulin, B. Glimepiride, C. Metformin, D. Gliclazide
C: Metformin
Answer: C: Metformin 
Explanation: None