Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Whipple Disease ?
    ### Response:
    The small intestine is part of the upper gastrointestinal (GI) tract and is a tube-shaped organ between the stomach and large intestine. The upper GI tract also includes the mouth, esophagus, stomach, and duodenum, or the first part of the small intestine.

    