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
Extensive involvement of deep white matter with bilateral hyperdense thalami on non-contrast CT scan of the brain is virtually diagnostic of - 
Select and explain. 
A. Alexander's disease, B. Krabbe's disease, C. Canavan's disease, D. Metachromatic leukodystrophy
B: Krabbe's disease
Answer: B: Krabbe's disease 
Explanation: Extensive involvement of deep white matter with bilateral hyperdense thalami on CT scan suggests the diagnosis of Krabbe's disease.