Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Parkinson's Disease ?
    ### Response:
    The National Institute of Neurological Disorders and Stroke (NINDS) has launched a broad effort called NIH Exploratory Trials in Parkinson's Disease, or NET-PD, to find drugs to slow the progression of Parkinson's disease. The first studies tested several compounds.
    