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
2nd generation sulfonylurea drugs are all except: 
Select and explain. 
A. Glipizide, B. Gliclazide, C. Tolbutamide, D. Glibenclamide
C: Tolbutamide
Answer: C: Tolbutamide 
Explanation: None