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: Medicine
A 60 year old male presents with features of atypical parkinsonism in conjunction with cerebellar signs and early and prominent autonomic dysfunction, usually ohostatic hypotension is MOST likely suffering from: 
Select and explain. 
A. Multisystem atrophy, B. Progressive supranuclear palsy, C. Coicobasal degeneration, D. Wilson disease
A: Multisystem atrophy
Answer: A: Multisystem atrophy 
Explanation: Multiple-system atrophy (MSA) manifests as a combination of parkinsonian, cerebellar, and autonomic features. Clinically, MSA is suspected when a patient presents with atypical parkinsonism with cerebellar signs and early autonomic dysfunction, usually ohostatic hypotension. Ref: Harrisons Principles of Internal Medicine, 18th Edition, Page 3318