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
In malignant lesion in pyriform fossa pain is referred to ear via 
Select and explain. 
A. Glossopharyngeal nerve, B. Vagus nerve, C. Brachial plexus, D. None of the above
B: Vagus nerve
Answer: B: Vagus nerve 
Explanation: None