Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) X-linked hypophosphatemia ?
    ### Response:
    X-linked Hypophosphatemia (XLH) is an inherited metabolic disorder characterized by low phosphate levels in the blood that can lead to softening and weakening of bones (rickets) as a result of improper processing of phosphate in the kidneys leading to phosphate wasting.
    