This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Peptic Ulcer Disease, Subject name: Medicine
[{'content': 'H.pylori causes all except; \nSelect and explain. \nA. Peptic ulcer, B. Maltoma, C. Carcinoid tumor, D. Gastric CA', 'role': 'user'}, {'content': 'Answer: C \nExplanation: H.pylori is gram negative bacteria, non sporing, micro aerophilic, extra cellular bacteria. H.pylori releases urease enzyme which conves urea to ammonia and ammonia stimulates G cells of stomach which in turn stimulates parietal cells and cause secretion of HCl and Hyperchlorydia. This acid travels into stomach & duodenum and causes peptic ulcers. * H.pylori is a type I carcinogen, which, if present in stomach or long term can cause cancer called MALTOMA (Mucosa Associated Lymphoid Tumor), which is a B-type NHL. Also Know mc site of duodenal ulcer in duodenum: D1 If ulcer at atypical site like D2, suspect Zollinger Ellison Syndrome IOC for H. pylori: Urease test (invasive procedure) Urea breath test: test for eradication of infection S. ELISA: Screening test for H.Pylori', 'role': 'assistant'}]