This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Abdomen & Pelvis, Subject name: Anatomy
Which is the water shed area of inferior mesenteric artery and internal iliac artery? 
Select and explain. 
A. Griffiths point, B. Sigmoid colon, C. Ano rectal junction, D. Sudeck's point
D: Sudeck's point
Answer: D: Sudeck's point 
Explanation: Ans. D Sudeck's pointRef: Yamada's Textbook of Gastroenterology, Vol I, P 104* Watershed area: It is the medical term referring to regions of the body that receive dual blood supply from the most distal branches of two large arteries.* Griffith's critical point: A potential watershed area present between superior and inferior mesenteric arterial system. It is located at the splenic flexure.* Sudeck's point: Located at the watershed area between inferior mesenteric artery and internal iliac artery. This point is located near the rectosigmoid junction.