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
[{'content': 'BAO/ MAO ratio > ______ is suggestive of diagnosis of ZES? \nSelect and explain. \nA. 0.1, B. 0.3, C. 0.6, D. 0.9', 'role': 'user'}, {'content': 'Answer: C \nExplanation: 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', 'role': 'assistant'}]