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
Dinesh, a 56-yr-aged man presents with complaints of the slowness of movements, postural instability, tremors, rigidity and memory loss. Most likely diagnosis is - 
Select and explain. 
A. Multi infarct dementia, B. Alzheimer's disease, C. Parkinsonism, D. None of the above
C: Parkinsonism
Answer: C: Parkinsonism 
Explanation: None