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': 'Aoic hiatus contains \nSelect and explain. \nA. Left gastric vein and thoracic duct, B. Thoracic duct and hemiazygos vein, C. Azygos vein and thoracic duct, D. Left vagus and thoracic duct', 'role': 'user'}, {'content': "Answer: C \nExplanation: The aoic opening is osseoaponeurotic.It lies at the lower border of the 12 th thoracic veebra.It transmits Aoa,Thoracic duct and Azygos vein. REF.B D Chaurasia's human anatomy,Vol 2,Fifth edition.Pg 337", 'role': 'assistant'}]