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
Humming bird sign on MRI is seen in 
Select and explain. 
A. Progressive supra nuclear palsy, B. Multiple sclerosis, C. Developmental venous malformation, D. All of the above
A: Progressive supra nuclear palsy
Answer: A: Progressive supra nuclear palsy 
Explanation: Humming bird sign - PSP.
Dawson's finger sign - Multiple sclerosis.