This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Pharmacology
[{'content': 'Agent required to heal stress ulcers: \nSelect and explain. \nA. H2 blockers, B. Proton pump inhibitors, C. Antacids, D. Bismuth', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. A. H2 blockersH2 blockers like ranitidine are the most effective drug in healing stress ulcer. Whereas PPI are most effective in inhibiting the gastric acid secretion.', 'role': 'assistant'}]