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
Oral hypoglycemic used in diabetes are ? 
Select and explain. 
A. Tolbutamide, B. Troglitazone, C. Bigunides, D. All
D: All
Answer: D: All 
Explanation: Ans. is 'a' i.e., Tobutamide; 'b' i.e., Troglitazone; 'c' i.e., Bigunides