Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Dementia With Lewy Bodies ?
    ### Response:
    Dementia with Lewy bodies (DLB) is one of the most common types of progressive dementia. The central features of DLB include progressive cognitive decline, fluctuations in alertness and attention, visual hallucinations, and parkinsonian motor symptoms, such as slowness of movement, difficulty walking, or rigidity.
    