Roger Has Changed a Great Deal

Multiple Choice

Roger has changed a great deal. He has a difficult time remembering things, even simple things like where he is or what year it is. He is having increasing difficulty understanding people or saying things that make sense to others. In addition, he rarely cleans himself anymore and acts in very inappropriate ways around others. Roger is exhibiting many signs of

A) depression.
B) anxiety disorder.
C) Parkinson's disease.
D) Alzheimer's disease.