Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) dopa-responsive dystonia ?
    ### Response:
    Dopa-responsive dystonia is a disorder that involves involuntary muscle contractions, tremors, and other uncontrolled movements (dystonia). The features of this condition range from mild to severe. This form of dystonia is called dopa-responsive dystonia because the signs and symptoms typically improve with sustained use of a medication known as L-Dopa.
    