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': 'True about upper GI. bleedding -a) Malaena is the only symptomb) Bleeding occurs beyond the ampula of vaterc) Endoscopy can best diagnose itd) Peptic ulcer is the MC cause e) ↑ed BUN \nSelect and explain. \nA. abd, B. acd, C. bde, D. cde', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Upper gastrointestinal bleeding (UG1B) refers to blood loss within the intraluminal GIT from any location between the upper esophagus to the duodenum at the ligament of Treitz\nPeptic ulcer disease is the MC cause of severe UG accounting for - 50% of total cases.\nUGIB presents as hematemesis and/or melena.\nEndoscopy is the diagnostic method of choice because of high sensitivity & specificity.\n↓BUN is a clue to the diagnosis of Upper GI bleed. Harrison (17/e p259) writes - "Other clues to upper GI bleed include hyperactive bowel sounds and an elevated blood urea nitrogen level (due to volume depletion and blood proteins absorbed in the small intestine)".', 'role': 'assistant'}]