This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Stomach & Duodenum, Subject name: Surgery
[{'content': 'The vessel which needs to be ligated in a patient with a bleeding peptic ulcer is: \nSelect and explain. \nA. Gastroduodenal aery, B. Superior pancreaticoduodenal aery, C. Left gastric aery, D. Left gastroepiploic aery', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The vessel which needs to be ligated in a patient with a bleeding peptic ulcer is gastroduodenal aery. Anteriorly placed ulcers tend to perforate posterior duodenal ulcers tend to bleed by eroding into the gastroduodenal aery."', 'role': 'assistant'}]