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: Radiology
[{'content': 'Investigation of choice for temporal bone injury: \nSelect and explain. \nA. CT scan, B. MRI, C. Angiography, D. Plain x-ray a', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. CT scan', 'role': 'assistant'}]