This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Stomach & Duodenum, Subject name: Surgery
[{'content': 'Urease breath test is used to diagnose in which bacteria: \nSelect and explain. \nA. Streptococci, B. H. pylori, C. C. jejuni, D. Bacteroides', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. (b) H. pyloriRef: Bailey and Love 27th edition Page 1114* For H. pylori the best non invasive investigation to diagnose the presence - Serology (ELISA)* The best investigation to diagnose eradication C13 and C14 urea breath test. Should be performed after - 4 weeks of therapy* The best invasive investigation (When Endoscopy is Done) to diagnose: Rapid urease test* The stain used for H. pylori: Giemsa or warthin starry stain (Gram staining is not used)* The fecal antigen test also is quite sensitive and specific for active H. pylori infection and may prove more practical in confirming a cure of H. pylori.', 'role': 'assistant'}]