This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anti Diabetes, Subject name: Pharmacology
[{'content': 'Lactic acidosis is a side effect of: \nSelect and explain. \nA. Phenformin, B. Metformin, C. Chlorpropramide, D. Glibenclamide', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e. Phenformin Both, phenformin and metformin cause lactic acidosis but phenformin more than metforminOther important adverse effects of oral hypoglycemicsHypersensitivityRashesPhotosensitivityAgranulocytosisChloe static jaundice (Only by chlorpropamide)Disulfiram like effect - ChlorpropamideNot safe in pregnancy (Sulfonylureas), secreted in milk.", 'role': 'assistant'}]