This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Brain Imaging: Inflammatory, Infectious, and Vascular Diseases, Subject name: Radiology
Tiger eye sign on MRI is seen in - 
Select and explain. 
A. Halloverden spatz disease, B. CHPS, C. Achalasia Cardia, D. None
A: Halloverden spatz disease
Answer: A: Halloverden spatz disease 
Explanation: Ans. is 'a' i.e., Halloverden spatz diseaseo Tiger eye is an abnormal T2 signal in the globus pallidus seen in Pantothenate kinase-2 (PANK-2) mutation of Holloverden spat disease.