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': 'Commonest complication of chronic gastric ulcer is which of the following? \nSelect and explain. \nA. Adenocarcinoma, B. Perforation, C. Lymphoma, D. Haematenesis', 'role': 'user'}, {'content': 'Answer: D \nExplanation: GI bleed is the commonest complication of acute or chronic gastric ulcer. Outlet obstruction is the least commonest complication.', 'role': 'assistant'}]