This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Umblicial cord and diaphragm, Subject name: Anatomy
[{'content': 'A 63-year-old man comes to an emergency depament with back pain, weakness, and shoness of breath. On examination, he has an aneurysm of the abdominal aoa at the aoic hiatus of the diaphragm. Which of the following pairs of structures would most likely be compressed? \nSelect and explain. \nA. Vagus nerve and azygos vein, B. Esophagus and vagus nerve, C. Azygos vein and thoracic duct, D. Thoracic duct and esophagus', 'role': 'user'}, {'content': 'Answer: C \nExplanation: ATA structures passes through aoic opening / aoic hiatus: A = Aoa; T = thoracic duct ;A= Azygos vein (sometimes) Openings of diaphragm :', 'role': 'assistant'}]