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: ENT
[{'content': 'Which nerve is responsible for reffered pain of the ear - \nSelect and explain. \nA. IX N., B. III N, C. XI N., D. XII N', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]