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
[{'content': 'Humming bird sign on MRI is seen in \nSelect and explain. \nA. Progressive supra nuclear palsy, B. Multiple sclerosis, C. Developmental venous malformation, D. All of the above', 'role': 'user'}, {'content': "Answer: A \nExplanation: Humming bird sign - PSP.\nDawson's finger sign - Multiple sclerosis.", 'role': 'assistant'}]