This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Misc., Subject name: Physiology
[{'content': 'A 66-year-old man presents with a sudden onset of diabetes, anorexia, weight loss, epigastric pain with radiation to back. Next best investigation for this patient is? \nSelect and explain. \nA. Ultrasound of abdomen, B. CT abdomen, C. Enteroclysis, D. Triple contrast barium enema', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B CT abdomenRef: Bailey and Love: 26th ed. page 1137* The clinical history of epigastric pain radiating to back points to pancreatic etiology. This patient may have developed pancreatic cancer. Sudden onset of diabetes in the elderly is also suggestive. The best imaging modality to image chronic pancreatitis or pancreatic malignancy is CT abdomen.* Choice A is ruled out as gas shadows of stomach obscure ultrasound view of pancreas.* Choice C is fluoroscopic intubation-infusion small- bowel examination which is used to evaluate for small bowel pathology while this patient has pancreatic lesion* Choice D is ruled out as it used for large bowel evaluation.', 'role': 'assistant'}]