Alzheimer Disease Is the Most Common Form of Dementia

Alzheimer disease is the most common form of dementia.It affects 10% of the population over age 65 and 50% of the population over age 85.Nerve cells in the areas of the brain associated with memory and cognition are replaced by abnormal clumps and tangles of a protein.Which of the following statements best describes this condition?

A) Neurons are not affected.
B) The disease is chronic, progressive, and irreversible.
C) The disorder is acute and related to a CVA.
D) The risk of developing the disease decreases with increasing age.
E) The disease improves learning and the retention of information.