<prompt> Which one of the following is not a cause of vitamin B12 deficiency?Blind-loop syndrome.Dietary deficiency.Intrinsic factor deficiency.Resection of ascending colon.  <response>: - Vit B12 is absorbed from ileum; hence resection of ascending colon has nothing to do with Vit B12 deficiency - Vit B12 deficiency is caused dt: Intake Absorption - dt decreased intrinsic factor, pancreatic ileal diseases, fish tape worm infection Requirement - as in children, pregnancy, lactation, blind loop syndrome 