This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pharmacology
Which of the following antidiabetic drugs cause weight loss? 
Select and explain. 
A. Metformin, B. SFU, C. Insulin, D. Nateglinide
A: Metformin
Answer: A: Metformin 
Explanation: Metformin a biguanide and insulin sensitizer produce weight loss so drug of choice for type 2 DM with obesity. Also used in cases of Polycystic ovarian disease. Ref: HL, KK Sharma 3rd ed pg 646