**Core Concept**
Alzheimer's disease is a neurodegenerative disorder characterized by progressive cognitive decline, memory loss, and behavioral changes. It is the most common cause of dementia, affecting millions of people worldwide. The pathophysiology of Alzheimer's involves the accumulation of amyloid-beta plaques and tau protein tangles in the brain, leading to neuronal damage and death.

**Why the Correct Answer is Right**
The correct answer is not a characteristic feature of Alzheimer's disease because it does not align with the established clinical and pathological hallmarks of the condition. Alzheimer's disease is primarily associated with memory loss, language difficulties, and visuospatial impairments, rather than the other options listed. The disease is also characterized by the presence of amyloid-beta plaques and tau protein tangles in the brain, which are not mentioned in the incorrect options.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because Alzheimer's disease is indeed associated with memory loss, which is a hallmark symptom of the condition. Memory loss is a key feature of Alzheimer's disease, and it is not a characteristic that is unique to other conditions.
* **Option B:** This option is incorrect because language difficulties are also a common feature of Alzheimer's disease. Patients with Alzheimer's often experience difficulties with language, including word-finding difficulties, naming, and comprehension.
* **Option C:** This option is incorrect because visuospatial impairments are also a characteristic feature of Alzheimer's disease. Patients with Alzheimer's often experience difficulties with spatial reasoning, navigation, and visual perception.
* **Option D:** This option is incorrect because it is not a characteristic feature of Alzheimer's disease. While patients with Alzheimer's may experience mood changes, such as depression or anxiety, this is not a defining feature of the condition.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that Alzheimer's disease is a heterogeneous condition, and not all patients will exhibit the same symptoms or characteristics. However, memory loss, language difficulties, and visuospatial impairments are common features of the condition.

**Correct Answer: A**