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': 'Which of the following factors contribute to the development of duodenal ulcer \nSelect and explain. \nA. 131\nI, B. 125\nI, C. 99\nTc, D. 32\nP', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]