Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Attention Deficit-Hyperactivity Disorder ?
    ### Response:
    Attention deficit-hyperactivity disorder (ADHD) is a neurobehavioral disorder that affects 3-5 percent of all American children. It interferes with a person's ability to stay on a task and to exercise age-appropriate inhibition (cognitive alone or both cognitive and behavioral).
    