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: Pathology
All are true about Neuroendocrine tumor of pancreas except: 
Select and explain. 
A. Insulinoma is MC, B. VIP cause diarrhea, C. Diarrhea is MC symptom of gastrinoma, D. Somatostatinoma cause gall stone formation
C: Diarrhea is MC symptom of gastrinoma
Answer: C: Diarrhea is MC symptom of gastrinoma 
Explanation: “Insulinomas are the most common pancreatic endocrine neoplasms and present with a typical clinical syndrome known as Whipple’s triad" - Schwartz
Gastrinoma (Zollinger-Ellison Syndrome); The most common presenting symptoms are an abdominal pain (70-100%), diarrhea (37-73%). and gastroesophageal reflux disease (GERD) (30- 35%); 10-20% have diarrhea only"-Harrison
Table: GI Neuroendocrine Tumor Syndrome