Which sign or symptom may develop for those with HIV/AIDS?

Individuals with HIV/AIDS can experience a range of neurological complications, one of which includes alterations in memory and confusion. This is largely due to the virus's impact on the central nervous system, which can lead to conditions such as HIV-associated neurocognitive disorder (HAND).

Cognitive issues may manifest as difficulties with concentration, memory deficits, and changes in behavior or personality. These neurological symptoms can result from direct viral infection of the brain, opportunistic infections, or inflammatory processes related to the disease.

Other options like severe abdominal pain, visual disturbances, or excessive thirst may occur in various medical conditions, but they are not as directly associated with the cognitive decline that can accompany HIV/AIDS as the alterations in memory and confusion. As such, the correct answer highlights a significant and well-documented effect of the virus on an individual's cognitive functions.