This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Liver, Subject name: Surgery
[{'content': "Couinaud's segments are used to divide which organ? \nSelect and explain. \nA. Liver, B. Lung, C. Spleen, D. Kidney", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. a (Liver). (Ref. Diagnostic ultrasound by Carol Rumac, 2nd ed., 89)SEGMENTAL LIVER ANATOMYFunctional segmental liver anatomy by Couinaud & Bismuth is based on distribution of 3 major hepatic veins & divides liver into 8 segements:# Middle hepatic vein:- -Divides liver into right and left lobe- -Also separated by main portal vein scissura, the cantile line passing through IVC & long axis of gall bladder# Left hepatic vein- -Divides left lobe into medial lateral sectors# Right hepatic vein- -Divides right lobe into anterior & posterior sectorsLiver segmentCorresponding lobeSegment ICaudate lobeSegment IILeft lateral superiorSegment IIILeft lateral inferiorSegment IVQuadrate lobe (AIIMS 2007 Nov)- Left medial superior- Left medial inferiorSegment VRight anterioinferiorSegment VIRight posteroinferiorSegment VIIRight posteriosuperiorSegment VIIIRight anteriosuperior', 'role': 'assistant'}]