Which has been identified as a primary sign of Alzheimer's disease?

• A. Severe fatigue
• B. Rapid physical deterioration
• C. Memory loss and confusion
• D. Extreme mood swings

Answer: (C)

Memory loss and confusion are primary signs of Alzheimer's disease, as they directly relate to the cognitive decline experienced by individuals with this condition. Alzheimer's disease primarily affects memory, leading to difficulties in recalling recent events or learning new information. As the disease progresses, this memory loss can become more severe, followed by confusion regarding time and place, impacting daily functioning and independence.

Confusion can manifest as disorientation, forgetting names of familiar people or places, and challenges with problem-solving or understanding visual images and spatial relationships. These cognitive impairments are hallmark symptoms that distinguish Alzheimer's from other types of dementia and cognitive disorders, making them critical for diagnosis and understanding the progression of the disease.

The other options, while they may be associated with various conditions, do not specifically identify the unique cognitive decline that characterizes Alzheimer's disease.