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': 'The sulphonylurea with relative longer duration of action is: \nSelect and explain. \nA. Chlorpropamide, B. Tolbutamide, C. Glibenclamide, D. Glipizide', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The duration of action of various sulfonylureas is given below:\nTolbutamide: 6-8 hours\nGlipizide: 10-16 hours\nGlibenclamide: 16-24 hours\nChlorpropamide: 30-36 hours', 'role': 'assistant'}]