<prompt> In Couinaud classification, segment IV of liver isCaudate lobeQuadrate lobeRight lobeLeft lobe  <response>: Segment 1 - caudate lobe, segment 4 - quadrate lobe ,.segments 1,2,3,4 left lobe, segments 5,6,7,8- right lobe Reference SRB edition :5 page:593 and internet 