This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: NEET Jan 2020, Subject name: Surgery
Which is the most common site of gastrinoma in MEN 1 syndrome? 
Select and explain. 
A. Jejunum, B. Ileum, C. Duodenum, D. Stomach
C: Duodenum
Answer: C: Duodenum 
Explanation: ZOLLINGER ELLISON SYNDROME/GASTRINOMA 75% cases are sporadic, 25% are associated with MEN1 M/C site - Duodenum > Pancreas 1st pa > 2nd pa > 3rd pa (4th not Involved) 90% of gastrinoma are present in Triangle of Passaro/Gastrinoma triangle M/C symptom - Abdominal pain Treatment DOC - Proton pump inhibitors TOC - Pylorus preserving Whipple's procedure