This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Surgery
[{'content': "Characteristic of H. Pylori is \nSelect and explain. \nA. Doesn't affect normal duodenal mucosa, B. Impoant cause for gastric ulcer, C. Protozoa, D. Antibiotics not useful", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Normal duodenum cannot harbour H pylori, duodenum with gastric metaplasia can very well get infected by H pylori which explains why it is involved in duodenal ulcer. It is a gram-negative spiral like flagellated organism, it is most common cause of duodenal ulcer (95%), triple regime including clarithromycin - metronidazole - omeprazole is used for its treatment Reference SRB edition :5 page : 819, 820', 'role': 'assistant'}]