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: Unknown
Portocaval (portosystemic) anastomosis is seen at all except - 
Select and explain. 
A. Esophagus, B. Liver, C. Rectum, D. Duodenum
D: Duodenum
Answer: D: Duodenum 
Explanation: Ans is 'd' i.e.. Duodenum Portocaval anastomosesSitePortalSystemicEsophagusEsophageal tributaries of left gastricHemizygousRectumSuperior rectalMiddle and inferior rectal ParaumbilicalAbove--superior epigastric and lateral thoracicRetroperitoneumSplenic, colicBelow--superficial epigastricSides--posterior intercostal and lumbarLeft renal and other tributaries of inferior venaBare area of liverPortal radicles of livercava (veins of Retzius)Diaphragmatic veinsFalciform ligamentParaumbilicalDiaphragmatic veins by an accessory portal system ofFissure for a Left branch of portal veinSappeyInferior vena cava via ductus venosusligamentum venosumPosterior vaginal wallSuperior rectalVaginal venous plexus