This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gall Bladder & Bile Ducts, Subject name: Surgery
The Lymph node to be involved in Cancer Gall bladder to be called as M1 Stage? 
Select and explain. 
A. Inter aortocaval node, B. Superior mesenteric node, C. Coeliac node, D. Pancreatico duodenal node
A: Inter aortocaval node
Answer: A: Inter aortocaval node 
Explanation: Ans. (a) interaortocaval NodeRef: Blumgart 6th Edition Page 788, 799* The first Manuever during Extended Cholecystectomy is to do Kocherisation and assess Aortocaval and Retro pancreatic nodes. The coeliac node must also be assessed; and Suspicious nodes sent for Frozen Section and if positive the procedure is terminated.* N1 = Metastases to nodes along cystic duct, common bile duct, hepatic artery, and/or portal vein* N2 = Metastases to periaortic, pericaval, superior mesenteric artery, and/or celiac artery nodes* M1 = Interaortocaval nodes