Lydia's Father Has Never Had a Great Memory When It

Multiple Choice

Lydia's father has never had a great memory when it comes to intricate details, but lately she is noticing more of a loss. Five years ago, he was diagnosed with a slight case of dementia. Lately, her father is demonstrating confusion and other major changes in his way of thinking. Testing from his doctor confirms that brain cells are failing and he is diagnosed with what disorder?

A) Cognitive delay syndrome
B) Autism syndrome
C) Social identity disorder
D) Alzheimer's disease