This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Large Intestine, Rectum, and Anal canal, 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: Ans. is 'c' i.e.. Rectosigmoid o There are areas of colon with poor blood supply resulting from incomplete anastomosis of marginal arteries. These are watershed areas of colon and include :1. Splenic flexure (Griffith point): Watershed area between superior mesenteric artery and inferior mesenteric artery.2. Rectosigmoid junction (Sudeck's point) : Watershed zone between inferior mesenteric artery and internal iliac artery.", 'role': 'assistant'}]