Final answer:
Alzheimer's disease is characterized by progressive dementia and memory loss.
Step-by-step explanation:
The correct statement regarding Alzheimer's disease is b. Alzheimer's disease is characterized by progressive dementia and memory loss.
Alzheimer's disease is a neurodegenerative disorder that primarily affects older adults. One of the main symptoms of Alzheimer's disease is progressive dementia, which involves a decline in cognitive abilities such as memory, thinking, and problem-solving. Memory loss is also a common symptom of the disease.
Therefore, option b is the true statement regarding Alzheimer's disease.