<prompt> Diphyllobothrium latum causes anemia by:Its blood sucking activitiesThe Production Of A Toxin That Affects HematopoiesisCompetition with the host for vitamin B12Occlusion of the common bile duct  <response>: Diphyllobothrium latum, also known as the fish or broad tapeworm, is the biggest worm and can reach 10 m in size. Humans acquire the infection by eating raw fish containing the larvae of the tapeworm. The worm attaches to the small intestine and causes abdominal discomfo. Nausea, diarrhea, weight loss, and pernicious anemia can result. The anemia is induced by the tapeworms tendency to compete with humans for vitamin B12, which it easily accumulates from the intestinal contents. Ref: Levinson W. 2012. Chapter 54. Cestodes. In W. Levinson Ed, Review of Medical Microbiology Immunology, 12e. 