This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Abdominal Radiography, Subject name: Radiology
[{'content': 'Coffee bean sign is seen in- \nSelect and explain. \nA. Sigmoid volvulus, B. Hepatocellular carcinoma, C. Gall stones, D. Paralytic ileus', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Sigmoid volvulus o 18 Fluorodeoxyglucoseis a radiopharmaceutical used in medical imaging modality positron emission tomography (PET).o Following are the tracers used in Positron emission tomography:18 Fluorodeoxyglucose - Poorly differentiated neuroendocrine tumorsCarbon labeled 5 HTP - Carcinoid111 In octreotide, 68 GaOctreotide, 64 Cu TETA Octreotide - Neuroendocrine tumors11C metomidaie - Adrenocortical tumors18 FDG PET - differentiate between benign and malignant adrenocortical tumors.", 'role': 'assistant'}]