Mrs Smith Has Been Diagnosed with a Cognitive Disorder Called

Mrs. Smith has been diagnosed with a cognitive disorder called dementia. All of the following could apply to Mrs. Smith, except:

A) Mrs. Smith's dementia could be caused by a psychiatric disorder such as a pain disorder
B) Mrs. Smith's dementia could be caused by a medical disease
C) Mrs. Smith's dementia could be caused by structural abnormalities
D) Mrs. Smith's dementia could be caused by substance withdrawal