Which Statement Is True of the Incidence of Dementia in Parkinson's

Multiple Choice

Which statement is true of the incidence of dementia in Parkinson's patients?

A) Dementia is not a symptom of Parkinson's disease.
B) All Parkinson's patients develop dementia.
C) Dementia occurs in as many as 80% of Parkinson's patients.
D) If dementia occurs, it will occur in the early stages of the disease.