<prompt> Which one of the following colonic polyps is not malignant?Juvenile polypsHamaomatous polyposis associated with Peutz-Jeghers SyndromeVillous adenomasTubular adenomas  <response>: Juvenile poyps have no malignant potential. All other conditions mentioned above are associated with increased risk of malignancy. So juvenile polyps is the single best answer of choice. Ref: Current Surgical Diagnosis and Treatment By Gerard M.Dohey, 12th Edition, Pages 682, 707. 