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': 'A neonate presents with congestive hea failure, on examination enlarging fontanelIae, bruit on auscultation, on USG shows midline hypoechoeic lesion, most likely diagnosis: \nSelect and explain. \nA. Malformation of vein of galen, B. Aqueduct stenosis, C. Arachnoid cyst, D. Medulloblastoma.', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. Malformation of vein of galen', 'role': 'assistant'}]