This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Thorax, Subject name: Anatomy
[{'content': '1. Which does not pass through the aoic opening(2018) \nSelect and explain. \nA. A) Aoa, B. B) Vagus nerve, C. C) Azygos vein, D. D) Thoracic duct', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The aoic hiatus trans- mits the aoa, thoracic duct, lymphatic trunks from the lower posterior thoracic wall and, sometimes, the azygos and hemiazygos veins', 'role': 'assistant'}]