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': 'Flushing is common in patient taking which of the following oral hypoglycemic drug with alcohol: \nSelect and explain. \nA. Chlorpropamide, B. Phenformin, C. Glibenclamide, D. Tolazamide', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]