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 vessel is most likely to get affected in ulcer perforation involving 1st pa of duodenum? \nSelect and explain. \nA. IVC, B. Gastroduodenal aery, C. Superior mesenteric aery, D. Inferior pancreaticoduodenal aery', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Gastroduodenal aery is most likely to get affected in ulcer perforation of first pa of duodenum as it is closely associated with the posterior wall of the duodenum. Ref: Clinical Anatomy by Regions edited by Richard S. Snell - 2007, Page 298', 'role': 'assistant'}]