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': 'The opening through which the right phrenic nerve passes is: \nSelect and explain. \nA. Aoic opening, B. Oesophageal opening, C. Vena caval opening, D. Directly pierces the diaphragm', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Vena caval opening', 'role': 'assistant'}]