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
Lactic acidosis is a side effect of: 
Select and explain. 
A. Phenformin, B. Metformin, C. Chlorpropramide, D. Glibenclamide
A: Phenformin
Answer: A: Phenformin 
Explanation: 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.