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: Forensic Medicine
[{'content': "Curling's ulcer common in which pa of duodenum: DNB 09; AIIMS 13 \nSelect and explain. \nA. 1st pa, B. 2nd pa, C. 3rd pa, D. Between 1st and 2nd pa", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. 1st pa', 'role': 'assistant'}]