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: Surgery
[{'content': 'Hpylori \nSelect and explain. \nA. Gram -ve non flagellate spiral organism, B. obligate parasite on gastric mucosa, C. Doesnot infect duodenal mucosa, D. Antibiotics not effective', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]