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': 'Which is the investigation of choice for fat embolism? \nSelect and explain. \nA. CT scan, B. MRI, C. Aerial blood gas analysis, D. Chest x-ray', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., CT scanIn case of ARDS due to fat embolism the investigation of choice is spiral CT pulmonary angiogram,", 'role': 'assistant'}]