Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Dopa-responsive dystonia ?
    ### Response:
    Dopa-responsive dystonia (DRD) is an inherited type of dystonia that typically begins during childhood but may begin in adolescence or adulthood. Depending on the specific type of DRD, specific symptoms can vary. Features can range from mild to severe. In most cases, dystonia begins in the lower limbs and spreads to the upper limbs over time.
    