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-Helicobacter pylori drugs are all of the following except: March 2010 \nSelect and explain. \nA. Clarithromycin, B. Amoxicillin, C. Metronidazole, D. Tetracycline', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. D: Tetracycline', 'role': 'assistant'}]