This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteria, Subject name: Microbiology
[{'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: Ans. is 'c' i.e., Gastric leiomyomaGastric leiomyoma is the most common benign tumour of the stomach occurring in middle age. Most leiomyomas of stomach are asymptomatic but ulceration may cause pain and signs of gastrointestinal bleeding and causative agent is not H. pylori.", 'role': 'assistant'}]