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: Medicine
Aery to bleed in duodenal ulcer haemorrhage: 
Select and explain. 
A. Splenic aery, B. Gastroduidenal aery, C. Left gastric aery, D. Superior mesenteric aery
B: Gastroduidenal aery
Answer: B: Gastroduidenal aery 
Explanation: Answer is B (Gastroduodenal Aery): The most common aerial source of a hemorrhage in duodenal ulcers is the gastroduodenal aery. `Bleeding ulcers in the duodenum are usually located on the posterior surface of the duodenal bulb. As the ulcer penetrates, the gastroduodenal aery is exposed and may become eroded. Ulcers on the anterior surface of the duodenal bulb are not prone to bleed since no major blood vessels lie on the anterior surface of the duodenal bulb.'