A 40 year-old female presents to the office with the chief complaint of diarrhea. She has been having . in the last month. She takes no medications, but is allergic to penicillin. She describes her life as but manageable. The physical exam reveals female in no acute distress. Her weight is 140 pounds (down from 154 at her last visit over a year ago), blood pressure of (orthostatic positive). standing, heart rate of 96 and regular without postural changes, respiratory rate of 18, and O2 saturation 99%. Further physical examination reveals:Skin: w/d, no acute lesions or rashesEyes: sclera clear, Ears: no acute changesNose: no erythema or sinus tendernessMouth: , right buccal mucosa, teeth good repair ( signs and symptoms of anemia)Neck: supple, no thyroid enlargement or tenderness, no lymphadenopathyCardio: S1 S2 regular, no S3 S4 or murmurLungs: CTA w/o rales, wheezes, or rhonchiAbdomen: scaphoid, (due to diarrhea), , APA format1.an explanation of the differential diagnosis ( for the patient in the case study that you selected.2. (