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 hyperdense thalamic lesion on non-contrast CT scan of the brain is seen in: \nSelect and explain. \nA. Krahhe's disease, B. Alexander disease, C. Metrachromatic Leukodystrophy, D. Cannavan's disease", 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. Krahhe's disease", 'role': 'assistant'}]