Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) xeroderma pigmentosum ?
    ### Response:
    Xeroderma pigmentosum, which is commonly known as XP, is an inherited condition characterized by an extreme sensitivity to ultraviolet (UV) rays from sunlight. This condition mostly affects the eyes and areas of skin exposed to the sun. Some affected individuals also have problems involving the nervous system.
    