Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Hodgkin Disease ?
    ### Response:
    Hodgkin disease is a type of lymphoma. Lymphoma is a cancer of a part of the immune system called the lymph system. The first sign of Hodgkin disease is often an enlarged lymph node. The disease can spread to nearby lymph nodes. Later it may spread to the lungs, liver, or bone marrow.
    