This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Medicine
A 74 yr old male patient was brought to the OPD by his daughter complaining of urinary incontinence and ataxia, also he has difficulty in calculating simple arithemetics and memory loss. What is the probable diagnosis 
Select and explain. 
A. Normal pressure hydrocephalus, B. Vascular dementia, C. VIT B12 dofficiency, D. Tabes dorsalis
A: Normal pressure hydrocephalus
Answer: A: Normal pressure hydrocephalus 
Explanation: CLINICAL FEATURES IN NORMAL PRESSURE HYDROCEPHALUS Difficulty walking. This problem can be mild or severe. ... Dementia. This often involves confusion, sho-term memory loss/forgetfulness, trouble paying attention, changes in mood, and a lack of interest in daily activities. Problems with bladder control. REF : HARRISONS 21ST ED