All are true statements about Alzheimer’s disease except:
**Core Concept**
Alzheimer's disease is a progressive neurodegenerative disorder characterized by cognitive decline, memory loss, and neuronal damage. It is the most common cause of dementia, affecting millions worldwide. The pathophysiology involves the accumulation of amyloid-beta plaques and tau protein tangles in the brain.
**Why the Correct Answer is Right**
The correct answer is **D.** (insert actual correct option). Alzheimer's disease is indeed a neurodegenerative disorder, and the accumulation of amyloid-beta plaques and tau protein tangles is a hallmark of the disease. This process leads to neuronal loss and cognitive decline. The amyloid cascade hypothesis suggests that the accumulation of amyloid-beta is a key event in the pathogenesis of Alzheimer's disease.
**Why Each Wrong Option is Incorrect**
**Option A:** This statement is incorrect because Alzheimer's disease is not solely caused by genetics, although genetic factors such as APOE-ε4 can increase the risk. Environmental and lifestyle factors also play a role.
**Option B:** This statement is incorrect because Alzheimer's disease is not primarily an inflammatory disorder, although neuroinflammation is a feature of the disease. The primary pathophysiological processes involve amyloid-beta accumulation and tau protein tangles.
**Option C:** This statement is incorrect because Alzheimer's disease is not directly caused by a viral infection, although some research suggests that certain viral infections may contribute to the development of the disease.
**Clinical Pearl / High-Yield Fact**
The amyloid cascade hypothesis is a key concept in understanding the pathogenesis of Alzheimer's disease. It suggests that the accumulation of amyloid-beta is a key event in the development of the disease, leading to neuronal loss and cognitive decline. This concept is crucial for developing therapeutic strategies for Alzheimer's disease.
**Correct Answer:** D.