Question

dementia is: a group of symptoms that accompany a disease forgetfulness a disease none of the above

Explanation:

Dementia is a group of symptoms including memory loss, cognitive decline etc. that are associated with various underlying diseases like Alzheimer's. It's not just forgetfulness on its own, and it's not a single - disease entity but rather a collection of symptoms related to brain - function impairment.

Answer:

A group of symptoms that accompany a disease