This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gastrointestinal tract, Subject name: Pharmacology
Which of the following agents is beneficial in NSAID induced gastric ulcer? 
Select and explain. 
A. PGE1 agonist, B. PGE2 agonist, C. PGD2 agonist, D. PGF2alpha agonist
A: PGE1 agonist
Answer: A: PGE1 agonist 
Explanation: functioning as natural ulcer protective by enhancing gastric mucus and HCO3 production as well as by improving mucosal circulation ESSENTIALS OF MEDICAL PHARMACOLOGY SEVENTH EDITION KD TRIPATHI PG NO.186