<prompt> Vitamin-B12 deficiency is not seen inResection of jejunumResection of ileumAchlorhydriaDestroy parietal cells  <response>: A Resection of jejunum VITAMIN B12: normally binds to intrinsic factor, the complex is taken up by cubilin, a high-affinity apolipoprotein in receptors in the distal ileum; Which triggers absorption of complex by endocytosis. In the ileal enterocytes, the cyanocobalamin transferred to Transcobalamin-ll, a cyanocobalamin transport protein that transports the vitamin in plasma. Cyanocobalamin deficiency is produced by Gastrectomy, with removal of the intrinsic factor-secreting tissue, by pernicious anemia, a disease in which there is autoimmune destruction of the parietal cells Vitamin B12 deficiency can also be produced by Diseasesresection of the distal ileum. In totally gastrectomized patients, the intrinsic factor deficiency must be circumvented by parenteral injection of cyanocobalamin. Achlorhydria refers to a state of low gastric acid output in the stomach. Gastric acid is needed to split B12 from food proteins and salivary beveling proteins. Hence gastric acid absence creates a deficiency of vitamin B12 