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 site of peptic ulcer perforation ? \nSelect and explain. \nA. Anterior aspect of the first pa of duodenum, B. Posterior aspect of the 1st pa of duodenum, C. Greater curvature of the stomach, D. Lesser curvature of the stomach', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.eAnterior aspect of the first pa of duodenum", 'role': 'assistant'}]