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
Eye of tiger sign on MRI is seen in 
Select and explain. 
A. Hallervorden spatz syndrome, B. Progressive supra nuclear palsy, C. Early onset levodopa - responsive Parkinsonism, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: The eye of tiger sign refers to abnormal low T2 signal on MRI in the globus pallidus with a logitudinal stripe of high signal (due to gliosis and spongiosis).