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
[{'content': 'Oral hypoglycemic used in diabetes are ? \nSelect and explain. \nA. Tolbutamide, B. Troglitazone, C. Bigunides, D. All', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'a' i.e., Tobutamide; 'b' i.e., Troglitazone; 'c' i.e., Bigunides", 'role': 'assistant'}]