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
Which of the following structures pass through the aoic hiatus of the diaphragm? 
Select and explain. 
A. Inferior vena cava, B. Oesophagus, C. Vagus nerve, D. Azygos vein
D: Azygos vein
Answer: D: Azygos vein 
Explanation: Aoic hiatus is located at the T12 veebral level, behind the two crura. The left and right crura form the left and right borders of the aoic opening. The aoic opening allows passage for the aoa, the azygos vein, hemiazygos vein and the thoracic lymphatic duct. The caval opening allows passage for the inferior vena cava and branches of the right phrenic nerve. The esophageal opening allows passage for the esophagus and the left and right vagus nerves. The esophageal branches of the left gastric aery and the esophageal tributaries of the left gastric vein also passes through this opening.