This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Medicine
[{'content': 'The Investigation of choice for diagnosing Zollinger Ellison syndrome includes \nSelect and explain. \nA. CT scan, B. Selective angiography, C. MRI, D. Endoscopic ultrasound', 'role': 'user'}, {'content': 'Answer: D \nExplanation: (D) Endoscopic ultrasound # Endoscopic ultrasound (EUS) permits imaging of the pancreas with a high degree of resolution (<5 mm).> EUS modality is particularly helpful in excluding small neoplasms within the pancreas & in assessing the presence of surrounding lymphnodes & vascular involvement.SENSITIVITY OF IMAGING STUDIES IN ZOLLINGER ELLISON SYNDROMEStudySensitivity, %Primary GastrinomaMetastatic GastrinomaUltrasound21-2814CT scan35-5935-72Selective angiography35-6833-86Portal venous sampling70-90N/ASASI55-7841MR!30-6071Octreoscan67-8680-100EUS80-100N/A', 'role': 'assistant'}]