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: Surgery
[{'content': 'A patient admitted with abdominal mass underwent MRI. and it revealed B/L adrenal calcification. Diagnosis? \nSelect and explain. \nA. Pheochromocytoma, B. Adrenal incidentalma, C. Neuroblastoma, D. Medullary thyroid cancer', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Neuroblastoma is characterized by abdomonal mass that often crosses midline and it shows stippled calcification on MRI.', 'role': 'assistant'}]