This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Physiology
[{'content': 'Structure passing through the opening marked 3 in the diaphragm is \nSelect and explain. \nA. Oesophagus, B. Left gastric nerve, C. Right phrenic nerve, D. Hemiazygos vein', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Caval opening T8- The caval opening passes through the central tendon of the diaphragm. It contains the inferior vena cava and the right phrenic nerve. Ref anatomy B. D. Chourasia thorax p54', 'role': 'assistant'}]