This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Raised ICP and Brain death, Subject name: Medicine
Mr X is a 70-year-old male who presents with a one-year history of progressive ataxia, urinary incontinence and memory loss. He is otherwise asymptomatic. He has no significant past medical history and is not on any medication. What is the most likely diagnosis? 
Select and explain. 
A. Normal pressure hydrocephalus, B. Cerebellar astrocytoma, C. Lewy body dementia, D. Multiple sclerosis
A: Normal pressure hydrocephalus
Answer: A: Normal pressure hydrocephalus 
Explanation: Normal pressure hydrocephalus: TRIAD: Progressive ataxia, urinary incontinence and memory loss (Dementia) INCREASED production of CSF at night time so ventricles get dilated along with the neighboring structures. In order to counter attack the pressure, the ventricular system gets dilated but this dilation might push the grey matter against the calverium (skull) l/t coical dementia in the patient. Cerebellum also affected d/t pressure l/t ataxia. Paracentral lobule in frontal lobe where the bladder control is present so urinary incontinence/stool incontinence