This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
[{'content': 'Which of the following inhibit gastric secretion by blocking H2 receptors: March 2013 \nSelect and explain. \nA. Omeprazole, B. Ranitidine, C. Sucralfate, D. Misoprostol', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B i.e. Ranitidine Ranitidine It is a histamine H2-receptor antagonist that inhibits stomach acid production. It is commonly used in treatment of peptic ulcer disease (PUD) and gastroesophageal reflux disease (GERD).', 'role': 'assistant'}]