Final answer:
Normal-pressure hydrocephalus is characterized by a triad of symptoms: dementia, incontinence, and gait disturbance. Parkinson's disease has similar but distinct symptoms. The correct answer is C. Dementia, incontinence, and gait disturbance.
Step-by-step explanation:
Normal-pressure hydrocephalus (NPH) is a condition characterized by a clinical triad of symptoms, which include dementia, urinary incontinence, and gait disturbance. These symptoms occur due to the accumulation of cerebrospinal fluid in the brain's ventricles without an increase in intracranial pressure. This condition is often mistaken for other neurodegenerative disorders, such as Parkinson's disease or Alzheimer's disease.
Parkinson's disease is another degenerative disorder of the central nervous system, which affects the muscular system and movement. Parkinson's disease presents symptoms such as muscle tremor, muscle rigidity, slowness of movement, and postural instability. These motor signs and symptoms are defining characteristics of Parkinson's disease. However, unlike NPH, Parkinson's disease does not typically feature the triad of dementia, incontinence, and gait disturbance seen in NPH.
Answering the student's question, the correct answer for the triad of symptoms presented in normal-pressure hydrocephalus is: C. Dementia, incontinence, and gait disturbance.