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': 'Central line preferred in trauma pt is \nSelect and explain. \nA. IJV, B. Subclavian vein, C. EJV, D. Any of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: IJV is preferred in trauma pts\nSubclavian is preferred in TPN', 'role': 'assistant'}]