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
[{'content': 'Triad of normal-pressure hydrocephalus includes : \nSelect and explain. \nA. Tremor, aphasia dementia, B. Ataxia, aphasia, gait disorder, C. Gait disorder, urinary incontinence, dementia, D. Gait disorder, urinary incontinence, lower cranial nerve palsy', 'role': 'user'}, {'content': 'Answer: C \nExplanation: 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', 'role': 'assistant'}]