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
Which nerve is responsible for referred pain to the ear? 
Select and explain. 
A. IX, B. III, C. XI, D. XII
A: IX
Answer: A: IX 
Explanation: (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.