This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ear, Subject name: ENT
[{'content': 'Which nerve is responsible for referred pain to the ear? \nSelect and explain. \nA. IX, B. III, C. XI, D. XII', 'role': 'user'}, {'content': 'Answer: A \nExplanation: (a) IX nerve, i.e. the glossopharyngeal nerve(Ref. Scott Brown, 8th ed., Vol 2, page 535)The rest of the nerves do not supply the ear.', 'role': 'assistant'}]