This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Magnetic Resonance Imaging, Subject name: Radiology
[{'content': "Hot Cross Bun Sign on MRI is seen in- \nSelect and explain. \nA. Multisystem atrophy, B. Lewy body dementia, C. Progressive supranuclear palsy, D. Alzeihmer's disease", 'role': 'user'}, {'content': 'Answer: A \nExplanation: * HOT CROSS BUN SIGN - cross shaped hyperintensity in the center of pons * It is a classic feature of Multisystem atrophy type - C * Multisystem atrophy type - c has involvement of pontocerebellar pathway Figure: hot cross bun sign - MSA-C Figure showing Humming bird sign in Progressive supranuclear palsy. Figure showing Mickey-Mouse sign in Progressive supranuclear palsy.', 'role': 'assistant'}]