This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Neuroradiology, Subject name: Radiology
[{'content': 'A 60 years old male patient came with complaint of spasticity in bilateral lower limbs. MRI was performed and shown below. \nSelect and explain. \nA. Multiple systemic atrophy- predominant parkinsonism, B. Progressive supranuclear palsy, C. Multiple systemic atrophy- predominant cerebellar ataxia, D. Lewy body dementia', 'role': 'user'}, {'content': 'Answer: C \nExplanation: HOT CROSS BUN SIGN- cross shaped hyperintensity in the centre of pons. It is a classic feature of Multisystem atrophy type - C. Multisystem atrophy type - c has involvement of pontocerebellar pathway', 'role': 'assistant'}]