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': 'Drug of choice as antidiabetic in obese patient: \nSelect and explain. \nA. Glipizide, B. Insulin, C. Tolbutamide, D. Metformin', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. D. MetforminMetformin is the first line treatment in case obese diabetic patient as it is known to cause weight loss. It doesn't cause the release of insulin and thus less chances of hypoglycemia.", 'role': 'assistant'}]