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
[{'content': 'Tiger eye sign on MRI is seen in - \nSelect and explain. \nA. Halloverden spatz disease, B. CHPS, C. Achalasia Cardia, D. None', 'role': 'user'}, {'content': "Answer: A \nExplanation: 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.", 'role': 'assistant'}]