单项选择题
A 70-year-old woman presented with impairment of brain functions, alterations of mood and behavior. Her family reported she was having progressive memory loss over the past 3 months. She had trouble handling money and paying bills, had poor judgment, and took longer to complete normal daily tasks. CT scan just shows minimal cerebral atrophy. Which of the following is the most likely diagnosis?
A.Parkinson disease
B.Manifestations of stress
C.Alzheimer disease
D.Normal aging process