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
Triad of normal-pressure hydrocephalus includes - 
Select and explain. 
A. Tremor, aphasia dementia, B. Ataxia, aphasia, gait disorder, C. Gait disorder, urinary incontinence, dementia, D. Gait disorder, urinary incontinence, lower cranial nerve palsy
C: Gait disorder, urinary incontinence, dementia
Answer: C: Gait disorder, urinary incontinence, dementia 
Explanation: None