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: Answer is C (Gait disorder, Urinary incontinence & Dementia): Normal Pressure Hydrocephalus (NPH) is a communicating hydrocephalus with a patent aqueduct of sylvius, caused by obstruction to normal flow of CSF over the cerebral convexities and delayed absorption into the venous system. Clinical triad Abnormal gait Q Dementia Q Urinary incontinence Q Neuroimaging Enlarged lateral ventricles Q (Hydrocephalus) Q with little or No Coical-Atrophy Q CSF picture Pressure : High normal range (Hence called NPH) Q Protein : Normal Q Sugar : Normal Q Cell count : Normal Q