This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Medicine
Which of the following is the most prominent feature of immunoproliferative small intestinal disease (IPSID) - 
Select and explain. 
A. Malabsorption, B. Obstruction, C. Bleeding, D. Abdominal pain
D: Abdominal pain
Answer: D: Abdominal pain 
Explanation: None