<prompt> Least predilection for distal ileum -Carcinoid syndromeMeckels diverticulumCrohn diseaseZollinger - Ellison syndrome  <response>: Ans. is d i.e., Zollinger-Ellison syndromeo Zollinger-Ellison syndrome gastrinoma does not usually occur in distal ileum,o Carcinoid syndrome, Meckels diverticulum and crohn disease can affect distal ileum. 