A senior woman always repeats statements and questions over and over， not realizing that she has asked the question before.She tends to forget conversations， appointments or events.This woman may be diagnosed with（）.

A senior woman always repeats statements and questions over and over， not realizing that she has asked the question before.She tends to forget conversations， appointments or events.This woman may be diagnosed with（）.
A.Down' s syndrome
B.Crohn' s disease
C.Parkinson' s disease
D.Alzheimer' s disease
正确答案：Alzheimer' s disease