<prompt> Which vein drain directly into IVC -Superior mesentric veinInferior mesentric veinHepatic veinSplenic vein  <response>: Veins draining into inferior vena cava- Common iliac veins- Renal veins- Right gonadal vein- Right suprarenal vein- Inferior phrenic veins- Hepatic veins- 3rd 4th lumbar veins 