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: Surgery
[{'content': 'Non-contrast spiral CT is investigation of choice for \nSelect and explain. \nA. Acute ureteric colic, B. Acute pulmonary embolism, C. Acute mesenteric ischemia, D. Acute prolapsed interveebral disc', 'role': 'user'}, {'content': 'Answer: A \nExplanation: NCCT (Non-contrast spiral/helical CT) is widely used and currently study of choice for renal colic.', 'role': 'assistant'}]