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
Watershed area between SMA and IMA which commonly result in ischemia is? 
Select and explain. 
A. Hepatic flexure, B. Splenic flexure, C. Rectosigmoid Jn., D. Ileocolic In.
B: Splenic flexure
Answer: B: Splenic flexure 
Explanation: There are several weak points in the colonic blood supply, known as watershed areas, which result from incomplete anastomoses of the marginal aeries.The two most common points are:- Griffith's point at the splenic flexure and- Sudeck's point at the rectosigmoid junction.Rectosigmoid junction is the watershed territory between IMA and the internal iliac aery.