question: Q:A 51-year-old man with a recent diagnosis of peptic ulcer disease currently treated with an oral proton pump inhibitor twice daily presents to the urgent care center complaining of acute abdominal pain which began suddenly less than 2 hours ago. On physical exam, you find his abdomen to be mildly distended, diffusely tender to palpation, and positive for rebound tenderness. Given the following options, what is the next best step in patient management?? 
  {'A': 'Abdominal radiographs', 'B': 'Urgent CT abdomen and pelvis', 'C': 'Upper endoscopy', 'D': 'H. pylori testing', 'E': 'Serum gastrin level'},