This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Benign Gastric Disease, Subject name: Surgery
[{'content': 'Most common cause of GI bleed is - \nSelect and explain. \nA. Duodenal ulcer, B. CA stomach, C. Oesophageal varices, D. Erosive gastritis', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Duodenal ulcer o Peptic ulcer disease is the most common cause of severe UGIB, accounting for upto 50% of cases.", 'role': 'assistant'}]