This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Surgery
[{'content': 'Investigation of choice in appendicitis in adults \nSelect and explain. \nA. CT Scan, B. USG, C. Serum ESR, D. MRI Abdomen', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Answer- A. CT Scan', 'role': 'assistant'}]