Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Myotonia congenita autosomal dominant ?
    ### Response:
    Myotonia congenita is a genetic condition characterized by the inability of the skeletal muscles to quickly relax after a voluntary movement.  The symptoms associated with the condition typically appear in childhood and vary from person to person. There are two forms of the disorder:  Becker type, which is the most common form; and Thomsen disease, which is a rare and milder form.
    