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: Orthopaedics
[{'content': 'Clincial feature of fat embolism includes all excepts - \nSelect and explain. \nA. Tachypnoea, B. Systmic hypoxia may occur, C. Fat globules in urine are diagnostic, D. Manifests after several days of trauma', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Clinical features of fat embolisms are evident within 1-3 days. About 25 percent of patients develop symptoms within 12 hours and 75 percent within 36 hours.', 'role': 'assistant'}]