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 the treatment of H. pylori is - \nSelect and explain. \nA. Cisapride, B. Clarithromycin, C. Metronidazole, D. Omeprazole', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Cisapride", 'role': 'assistant'}]