<prompt> The most impoant structure involved in the development of inferior vena cavaSupra cardinal vein and sub cardinal veinPersistence of Supra cardinal veinsPersistence of sub cardinal veinsPersistence of both supra and sub cardinal vein  <response>: Inferior vena cava develop from sub cardinal vein especially the renal segment and the post renal segment. Right posterior cardinal vein contributes the inferior most component of IVC. Ref: Grays 39ep-210-220 