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: Radiology
[{'content': 'Best imaging modality for neuroendocrinal tumors – \nSelect and explain. \nA. PELT, B. CELT, C. Radio nucleotide scan, D. MRI with gadolinium scan', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Because of its greater sensitivity than conventional imaging (CT, MRI, USG) and its ability to localize tumor throughout the body at one time, SRS (Somatostatin receptor scintigraphy) is now the imaging modality of choice for localizing both primary and metastatic NET tumors. (except for insulinoma).\nBest modality of localizing insulinoma is endoscopic USG.', 'role': 'assistant'}]