This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Radiology
[{'content': "This young patient came with acute right lower abdominal pain. What is the possible diagnosis? \nSelect and explain. \nA. Acute salpingoophoritis, B. Acute appendicitis, C. Ruptured ectopic pregnancy, D. Intestinal obstruction due to Meckel's diveiculum", 'role': 'user'}, {'content': 'Answer: B \nExplanation: CT has become the imaging test of choice for the diagnosis of appendicitis. Sensitivity and specificity range from 94% to 98% based on findings of a thickened appendix with some degree of adjacent inflammationThe main CT criteria for acute appendicitis are periappendiceal inflammatory changes, an appendix with a diameter of more than 6 mm, or a wall thickness of more than 3 mm.', 'role': 'assistant'}]