This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Small and Large Intestines, Subject name: Pathology
Least predilection for distal ileum - 
Select and explain. 
A. Carcinoid syndrome, B. Meckel's diverticulum, C. Crohn disease, D. Zollinger - Ellison syndrome
D: Zollinger - Ellison syndrome
Answer: D: Zollinger - Ellison syndrome 
Explanation: Ans. is 'd' i.e., Zollinger-Ellison syndromeo Zollinger-Ellison syndrome (gastrinoma) does not usually occur in distal ileum,o Carcinoid syndrome, Meckel's diverticulum and crohn disease can affect distal ileum.