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': "Extensive involvement of deep white matter with bilateral hyperdense thalami on non-contrast CT scan of the brain is virtually diagnostic of - \nSelect and explain. \nA. Alexander's disease, B. Krabbe's disease, C. Canavan's disease, D. Metachromatic leukodystrophy", 'role': 'user'}, {'content': "Answer: B \nExplanation: Extensive involvement of deep white matter with bilateral hyperdense thalami on CT scan suggests the diagnosis of Krabbe's disease.", 'role': 'assistant'}]