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: Biochemistry
VIP levels are extraordinarily high in: 
Select and explain. 
A. Verner-morrison syndrome, B. Celiac disease, C. Zollinger ellison syndrome, D. Paraganglioma
A: Verner-morrison syndrome
Answer: A: Verner-morrison syndrome 
Explanation: VIP belongs to the family of secretin and glucagon. VIP is usually produced by neurons. So its levels are kept minimum in blood normally. But in pancreatic cholera (Verner morrison syndrome) VIP levels are extraordinarily high in serum. It leads to watery diarrhea, hypokalemia, achlorhydria. Ref: Sleisenger and Fordtran's, Edition-9, Page-7