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': '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: C i.e. Azygos vein and thoracic duct', 'role': 'assistant'}]