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': 'After an operation on femur bone, chest X-ray shows widespread mottling throughout the lung field like a snowstorm. It is diagnostic of \nSelect and explain. \nA. Fat embolism, B. Shock lung, C. Bronchopneumonia, D. Atelectasis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Fat embolsm', 'role': 'assistant'}]