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
Anti H. pylori drugs all except - 
Select and explain. 
A. Oxytetracycline, B. Amoxicilline, C. Bismuth subcitrate, D. Omeprazole
D: Omeprazole
Answer: D: Omeprazole 
Explanation: 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.