Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Barrett esophagus ?
    ### Response:
    Barrett esophagus is a condition in which the lining of the esophagus (the tube that carries food from the throat to the stomach) is replaced by tissue that is similar to the lining of the intestines. Although this change does not cause any specific signs or symptoms, it is typically diagnosed in people who have long-term gastroesophageal reflux disease (GERD).
    