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
Which of the following is a GLP-1 agonist? 
Select and explain. 
A. Pramlintide, B. Exenatide, C. Sitagliptin, D. None of the above
B: Exenatide
Answer: B: Exenatide 
Explanation: Alpha-Glucosidase inhibitors |Glucose absorption Acarbose, Miglitol Dipeptidyl peptidase IV inhibitors Prolong endogenous GLP-1 action Sitagliptin GLP-1 agonist |Insulin, |Glucagon, slow gastric emptying Exenatide Amylin agonist Slow gastric emptying, |Glucagon Pramlintide Ref: KD TRIPATHI 8TH ED.