Below is an instruction from Human. Write a response.
    ### Instruction:
    What causes Autoimmune hepatitis ?
    ### Response:
    What causes autoimmune hepatitis? Although the exact cause of autoimmune hepatitis is unknown, evidence suggests that liver injury in a patient with autoimmune hepatitis is the result of a cell-mediated immunologic attack. This autoimmune attack may be triggered by genetic factors, viral infections, or chemical agents.
    