An early sign of Alzheimer's disease is forgetfulness.

• A. Forgetfulness
• B. Hallucinations
• C. Fever
• D. Drowsiness

Answer: (A)

Memory loss, especially forgetting recently learned information, is the earliest sign of Alzheimer's disease. This reflects early disruption in memory circuits like the hippocampus and entorhinal cortex, which are responsible for forming new memories. As these areas are affected, a person may have trouble recalling recent events, names, or conversations, and might repeatedly ask the same questions or misplace items. Other symptoms come in later or are less specific to Alzheimer's in its early stage. Hallucinations are not typical early signs and are more associated with other conditions or with certain types of dementia. Fever points to infection rather than a neurodegenerative process. Drowsiness is nonspecific and can accompany many issues such as sleep disruption, medications, or other illnesses. So forgetfulness is the best indicator of the early change seen in Alzheimer's.