Question: An 80-year-old male presents for evaluation of blood in his stool. He does not regularly seek medical care and has noted blood mixed with his stool for several months. He admits to a 15lb unintentional weight loss over the past 6 months and has never had a colonoscopy. The patient denies any abdominal pain or vomiting. Which test should be arranged as soon as possible to make a definitive diagnosis? A. Colonoscopy B. Barium swallow C. Complete abdominal X-ray series D. CT scan of abdomen and pelvis