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: Microbiology
[{'content': 'True about helicobacter pylori are all except - \nSelect and explain. \nA. Urea breath test is diagnostic, B. Grain negative, flagellate bacilli, C. Risk factor for development of adenocarcinoma of stomach, D. It provides life long immunity', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]