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: Anatomy
[{'content': 'Not related to hilum of right lung? \nSelect and explain. \nA. Azygous vein, B. Vagus nerve, C. SVC, D. Arch of aoa', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Arch of aoa is related to left lung.', 'role': 'assistant'}]