Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Autoimmune Hepatitis ?
    ### Response:
    Autoimmune hepatitis is classified into several types. Type 1 autoimmune hepatitis is the most common form in North America. Type 1 can occur at any age; however, it most often starts in adolescence or young adulthood. About 70 percent of people with type 1 autoimmune hepatitis are female.
    