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': 'Duodenal ulcer, true statement is - \nSelect and explain. \nA. Never Malignant, B. Most-common site is IInd pa, C. Common in blood group AB, D. GI bleed not seen', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Answer- A. Never MalignantDuodenal ulcer is more common in persons with blood group\'O\', i.e., containing no AB antigens with blood group\'O" i\'e"containing no AB antigens.Bleeding is more common in duodenal ulcer than in gastric ulcer.', 'role': 'assistant'}]