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
55-year-old male with a recurrent episode of fall, rigidity and autonomic insufficiency - 
Select and explain. 
A. Railey day syndrome, B. Shy-dragger syndrome, C. Basal ganglionic lesion, D. Parkinsonism
B: Shy-dragger syndrome
Answer: B: Shy-dragger syndrome 
Explanation: None