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: Unknown
[{'content': 'New born male baby presented with congestive heart failure.  On examination enlarged fontanelles, a loud cranial bruit and following radiological finding was noted-the most likely diagnosis: \nSelect and explain. \nA. Sinus peri cranii, B. Vein of Galen malformation, C. Arachnoid cyst, D. Dandy walker malformation', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ref. Grainger and Allison's Diagnostic Radiology. Page. 189", 'role': 'assistant'}]