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: Anatomy
[{'content': 'Watershed zone of large intestine ? \nSelect and explain. \nA. Cecum, B. Ascending colon, C. Rectosigmoid, D. Transverse colon', 'role': 'user'}, {'content': "Answer: C \nExplanation: There are areas of colon with poor blood supply resulting from incomplete anastomosis of marginal aeries. These are watershed areas of colon and include :Splenic flexure (Griffith point) : Watershed area between superior mesenteric aery and inferior mesenteric aery.Rectosigmoid junction (Sudeck's point) : Watershed zone between inferior mesenteric aery and internal iliac aery.", 'role': 'assistant'}]