<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 70-year-old man with a history of chronic constipation presents to the emergency department with a two-day history of left lower quadrant abdominal pain. He is found to have a temperature of 100.8F, BP 14090, HR 85, and RR 16. On physical examination, he is tender to light palpation in the left lower quadrant and exhibits voluntary guarding. Rectal examination reveals heme-positive stool. Laboratory values are unremarkable except for a WBC count of 12,500 with a left shift. Which of the following tests would be most useful in the diagnosis of this patients disease?? A: Abdominal x-ray, B: Lipase, C: Abdominal CT, D: Left lower quadrant ultrasound, E: Emergent colonoscopy,  <response>: This is a patient with symptoms and exam findings concerning for diverticulitis, including left lower quadrant pain, tenderness, and guarding, as well as heme-positive stool. The question is asking which test would be most useful to diagnose the patients disease. Based on the clinical presentation, the most likely diagnosis is acute diverticulitis. To confirm this diagnosis, imaging of the lower left quadrantcolon would be indicated. Of the choices given, abdominal CT would provide the most detailed images of the affected region and allow definitive diagnosis of diverticulitis. Abdominal x-ray may show nonspecific findings but would not confirm the diagnosis. Lipase would not be useful for evaluating diverticulitis. Left lower quadrant ultrasound may detect inflammation but CT would give more definitive results. Emergent colonoscopy would be contraindicated in a patient with possible perforated diverticulitis.C: Abdominal CT 