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': 'All of the following are H2 blockers except ? \nSelect and explain. \nA. Cimetidine, B. Ranitidine, C. Famotidine, D. Omeprazole', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is `d' i.e., Omeprazole Drugs for peptic ulcer 1. Reduce gastric acid secretion a) H2 antihistaminic - Cimetidine, Ranitidine, Famotidine, Roxatidine. b) Proton pump inhibitors - Omeprazole, Lansoprazole, Pantoprazole, Rabeprazole, Esomeprazole. c) Anticholinergics - Pirenzepine, propantheline, oxyphenonium. d) Prostaglandin analogue - Misoprostol, enprostil, rioprostil. 2. Neutralization of gastric acid (antacids) a) Systemic - Sodium bicarbonate, sodium citrate. b) Non systemic - Magnesium hydroxide, Mag. trisilicate, aluminium hydroxide, Magaldrate, calcium carbonate. 3. Ulcer protectives Sucralfate, colloidal bismuth subcitrate, Prostaglandin analogue. 4. Anti H. pylori durgs Amoxicillin, clarithromycin, metronidazole, Tinidazole, tetracycline. Note - PG analogue have both antisecretory (|- HC1 secretion) as well as cytoprotective action.", 'role': 'assistant'}]