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': 'Most common cause of upper GI bleed \nSelect and explain. \nA. Gastric cancer, B. Oesophageal varices, C. Duodenal ulcers, D. Gastric ulcers', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Answer- C. Duodenal ulcersCauses ofupper GI bleeding (in descending order)Peptic ulcer - Duodenal ulcer - gastric ulcerOesophageal varicesGastritis erosionsMallory-Weiss tearsUncommon causes - Gastric carcinoma, esophagitis, pancreatits.', 'role': 'assistant'}]