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': 'A 22 year old male is admitted with fracture of the left femur. Two days later, he becomes mildly confused, has a respiratory rate of 40/min and scattered patechial rash on his upper torso. Chest X-ray shows patchy alveolar opacities bilaterally. His aerial blood gas analysis is abnormal. The most likely diagnosis is \nSelect and explain. \nA. Cerebral oedema with early neurogenic pulmonary oedema, B. Pulmonary thrombo-embolism, C. Chest contusion, D. Fat embolism', 'role': 'user'}, {'content': 'Answer: D \nExplanation: D i.e. Fat embolism', 'role': 'assistant'}]