Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) cartilage-hair hypoplasia ?
    ### Response:
    Cartilage-hair hypoplasia is a disorder of bone growth characterized by short stature (dwarfism) with other skeletal abnormalities; fine, sparse hair (hypotrichosis); and abnormal immune system function (immune deficiency) that can lead to recurrent infections.
    