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 76 year old male comes with a history of frequent falls and difficulty in looking downwards and laterally. The diagnosis is : 
Select and explain. 
A. Alzheimer's disease, B. Supranuclear palsy, C. Amyotropic lateral sclerosis, D. Oculornotor nerve palsy
B: Supranuclear palsy
Answer: B: Supranuclear palsy 
Explanation: Answer is B (Supranuclear palsy):