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': 'Drug not used in treatment of H pylori is: \nSelect and explain. \nA. Cisapride, B. Clarithromycin, C. Metronadizole, D. Omperazole', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Cisapride', 'role': 'assistant'}]