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': 'In a case of chest pain with pericarditis and pericardial effussion, pain is referred by? \nSelect and explain. \nA. Phrenic nerve, B. Superficial cardiac plexus, C. Deep cardiac plexus, D. Vagus nerve', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Phrenic nerveThe pericardium is composed of two layers.The tough external layer, the fibrous pericardium. The parietal layer of serous pericardium is attached to its internal surface. The visceral layer of serous pericardium is fused to the hea.The fibrous and parietal pericardia are supplied by the phrenic nerve (C3-05). They are sensitive to pain.The visceral pericardium or epicardium is supplied by autonomic nerves, not sensitive to pain.', 'role': 'assistant'}]