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
Osteoporosis is an ADR of which antidiabetic? 
Select and explain. 
A. Metformin, B. Glibenclamide, C. Pioglitazone, D. Acarbose
C: Pioglitazone
Answer: C: Pioglitazone 
Explanation: Risk of osteoporosis is high for glitazone users when compared to people who are on other anti diabetic drugs. Ref: KD Tripathi 8th ed.