70 year old man with weight loss

A 70-year-old man who presented to the outpatient clinic with diarrhea and complaints of a twelve pound weight loss over six months. He also had experienced anorexia for one month. He did not complain of fever, chills, lymphadenopathy, nausea, vomiting, abdominal pain, melena, hematochezia, palpitations or flushing. The patient's physical exam was notable only for heme-occult positive brown stool. His laboratory studies revealed a mild normocytic anemia (PCV 39.9%, MCV 91.3 ml) and a chronically elevated alkaline phosphatase of 138 IU/liter. The electrolyte panel, thyroid function tests, erythrocyte sedimentation rate, and prostate specific antigen were all within normal limits. what diagnostic test would you order?

a) Ultrasound abdomen

b) Chest Xray

c) CT scan of the abdomen

d) full colonoscopy

e) Prostatic biopsy 

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