Final answer:
The prominent medical symptom associated with normal pressure hydrocephalus is urinary incontinence, which is part of the symptom triad that includes gait disturbances and dementia.
Step-by-step explanation:
Normal pressure hydrocephalus (NPH) is a condition characterized by the triad of symptoms: gait disturbances, dementia, and urinary incontinence. Of the options provided, urinary incontinence (E) is a prominent medical symptom associated with NPH. This condition occurs as a result of the enlargement of the brain's ventricular system without an increase in cerebrospinal fluid pressure, which can affect brain functions, including those that control the bladder. Other symptoms that can occur with NPH include difficulty in walking, which may be mistaken for clumsiness, and cognitive impairment. However, the symptoms listed in options A, B, C, and D are not characteristic of normal pressure hydrocephalus.