<prompt> The water shed area in the marginal aery of Drummond is atJunction of proximal 23rd and distal 13 of transverse colonJunction of Ascending and transverse colonSplenic flexureAt rectosigmoid junction  <response>: Answer- C. Splenic flexureThe blood supply of colon is derived from the marginal aery of Drummond.It is a paracolic anastomotic aery formed by anastomosis between colic branches of superior mesentric aery ileocolic, right colic, middle colic and colic branches of inferior muentetic aety left colic and sigmoidal aeries, 