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': 'Anti H. pylori drugs all except - \nSelect and explain. \nA. Oxytetracycline, B. Amoxicilline, C. Bismuth subcitrate, D. Omeprazole', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. is \'d\' i.e., Omeprazole o Omeprazole is used in H. pylori infection to raise the gastric pH because rise in gastric pH enhances the anti-H. Pylori action of the antibiotics. Omeprazole does not have anti-H. pylori action. o Anti H. Pylori drugs are Amoxicillin Metronidazole Tetracycline (oxytetracycline) Clarithromycin Tinidazole o Bismuth subcitrate also have anti-H. Pylori action ? "It directly kills this organism". Note - Ranitidine is also used to raise gastric pH, it does not have anti H. pylori action.', 'role': 'assistant'}]