This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Pharmacology
[{'content': 'Lactic acidosis is common in \nSelect and explain. \nA. Metformin, B. Phenformin, C. Repaglinide, D. Rosiglitazone', 'role': 'user'}, {'content': 'Answer: B \nExplanation: (Phenformin) (247-KDT) (689-BB) (267-KDT 6th)* Lactic acidosis more common in Phenformin and rare in Metformin* * Hypoglycemia is the most common adverse effect with sulphonyl ureas.Repaglinide indicated only in type 2 DM as an alternative to sulfonyl ureas.* It should be avoided in liver diseaseRosiglitazone - Thiozolidinediones* It is indicated once daily in patients not controlled by metformin alone.* It is contraindicated by cardiac or hepatic failure.* Weight gain and oedema are the main adverse effects others - headache, myalgia and mild anaemia', 'role': 'assistant'}]