Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Achondroplasia ?
    ### Response:
    Achondroplasia is a disorder of bone growth that prevents the changing of cartilage (particularly in the long bones of the arms and legs) to bone. It is characterized by dwarfism, limited range of motion at the elbows, large head size, small fingers, and normal intelligence.
    