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: Medicine
[{'content': 'Which of the following statements is true regarding fat embolism - \nSelect and explain. \nA. Most patients with major trauma involving long bones have urinary fat globules, B. All patients with urinary fat globules develop fat embolism, C. Peak incidence of respiratory insufficiency for pulmonary fat embolism is around day 7 after injury, D. Heparin as an anticoagulant decreases mortality and morbidity in fat embolism syndrome', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]