Alzheimer's Disease vs Dementia with Lewy Bodies: Basic Facts

Which of the following statement is INCORRECT regarding AD (Alzheimer's Disease) Vs DLB (Dementia with Lewy Bodies):

(a) Memory impairment in DLB usually appears later in disease course, than in AD.
(b) DLB have greater impairment of attention and executive functions, than in AD..
(c) APOE e4 is a risk factor for late onset AD, but has little effect on disease onset or duration in DLB.
(d) DaT SPECT scan is FDA approved for detecting loss of functional dopaminergic neuron terminals in striatum and can differentiate between AD & DLB.
(e) All of the above are correct.
(f) All of the above are wrong.


(NOTE: DaT SPECT scan- Dopamine transporter Single Photon Emission CT)