This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Thorax, 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: The fibrous and parietal pericardia are supplied by phrenic nerves.They are sensitive to pain.Pain of pericarditis originates in the parietal pericardium alone. B D CHAURASIA'S HUMAN ANATOMY UPPER LIMB THORAX-VOLUME-1 SIXTH EDITION Page no-251", 'role': 'assistant'}]