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': 'Which of the following drug is not a component of triple drug therapy for helicobacter pylori: March 2008 \nSelect and explain. \nA. Lansoprazole, B. Clarithromycin, C. Metronidazole, D. Cimetidine', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. D: Cimetidine Triple therapy is considered to be the standard treatment for children. A proton pump inhibitor combined with two antibiotics has been shown to be very effective in clearing H pylori from the stomach. The current recommendation is treatment with amoxicillin, clarithromycin, and a proton pump inhibitor (lansoprazole) for 2 weeks.', 'role': 'assistant'}]