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': 'Osteoporosis is an ADR of which antidiabetic? \nSelect and explain. \nA. Metformin, B. Glibenclamide, C. Pioglitazone, D. Acarbose', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Risk of osteoporosis is high for glitazone users when compared to people who are on other anti diabetic drugs. Ref: KD Tripathi 8th ed.', 'role': 'assistant'}]