This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Zollinger Ellision Syndrome, Subject name: Medicine
BAO/ MAO ratio > ______ is suggestive of diagnosis of ZES? 
Select and explain. 
A. 0.1, B. 0.3, C. 0.6, D. 0.9
C: 0.6
Answer: C: 0.6 
Explanation: IOC: SECRETIN study Localization - EUS > MRI Risk of Refractory P.U.D + Secretory diarrhea. MC site ZES is D2- Duodenal wall (D2 pa)>Pancreas Usual Location is Gastrinoma triangle