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 40 yrs old man, was admitted with fracture shaft femur following a road traffic accident. On 2nd day he became disoriented. He was found to be tachypnoeic, and had conjunctival petechiae. Most likely diagnosis is: \nSelect and explain. \nA. Pulmonary embolism, B. Sepsis syndrome, C. Fat embolism, D. Hemothorax', 'role': 'user'}, {'content': "Answer: C \nExplanation: Patient with history of fracture of long bone becomes tachypnoeic on the 2nd day and development of conjunctival petechiae indicates fat embolism. Ref: Rockwood and Green's 'Fractures in Adult', 2nd Edition, Page 482", 'role': 'assistant'}]