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: Medicine
[{'content': 'Helicobacter pylori is not associated with \nSelect and explain. \nA. Gastrointestinal lymphoma, B. Gastric cancer, C. Gastric leiomyoma, D. Peptic ulcer', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]