This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Psychiatry
Alzheimer's Disease is associated with : 
Select and explain. 
A. Delerium, B. Delusion, C. Dementia, D. Depression
C: Dementia
Answer: C: Dementia 
Explanation: Answer is C (Dementia): Alzheimer's Disease is the most common cause of Dementia in elderly.Clinically, AD most often presents with subtle onset of memory loss followed by slowly progressive dementia that has a course of several years.