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': 'Medusa head appearance on MRI is seen in \nSelect and explain. \nA. AV malformation, B. Venous angioma, C. Cavernous hemangioma, D. Vein of galen malformation', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Veins are small at periphery and gradually enlarge as they approach a central draining vein - caput medusa or medua head.\nserpentine apperance of the curvilinear peripheral draining veins seen in venous malformation (venous angioma).', 'role': 'assistant'}]