This Disease Was First Described in 1906 and a Century

This disease was first described in 1906 and a century later, we still do not have a cure. It is a common form of dementia that causes intellectual inabilities and memory loss. Brain cells deteriorate and die in increasing numbers interfering with daily life and eventually cause death. What would an individual with this disease be suffering from?

A) Cognitive memory disorder
B) Social identity disorder
C) Alzheimer disorder
D) Degenerative dementia