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': 'True about Helicobacter pylori are all except: \nSelect and explain. \nA. Urea, breath test is diagnostic, B. Gram negative, flagellated bacilli, C. Risk factor for development of adenocarcinoma of stomach, D. It provides life-long immunity', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., It provides life-long immunity(Ref: Harrison, 17th/e, p. 946, 19th/e, p. 1038; Ananthanarayan, 9th/e, p. 400)Helicobacter pylori infection doesn't provide life-long immunity.", 'role': 'assistant'}]