Which of the Following Statements Is True

Which of the following statements is true?

A) Dementia appears to be a general consequence of ageing.
B) Dementia has not been associated with changes in the nervous system.
C) The incidence of dementia is predicted to increase over the next twenty-five years.
D) The prevalence of dementia is between 25% and 50% in people who are more than 85 years of age.
E) Dementia affects approximately 20% of the population over age 65.