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': 'True about cause of Lactic Acidosis is that it is mainly caused by intake of: \nSelect and explain. \nA. Biguanides, B. Glibenclamide, C. Tolbutamide, D. Chlorpropamide', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Biguanides', 'role': 'assistant'}]