This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pancreas, Subject name: Pharmacology
Which of the following drugs is taken during the first pa of the meal for the purpose of delaying absorption of dietary carbohydrates? 
Select and explain. 
A. Acarbose, B. Glipizide, C. Metformin, D. Exenatide
A: Acarbose
Answer: A: Acarbose 
Explanation: Acarbose is alpha glucosidase inhibitor. It inhibits the breakdown of complex carbohydrates to simple carbohydrates and thus they decrease the absorption. Glipizide is second generation sulphonylurea which helps in secretion of insulin. Metformin is biguanide which decrease the synthesis of glucose. Exenatide is GLP-1 analogue which delay in gastric emptying, decrease appetite and augment glucose secretion.