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': 'In carcinoma, base of tongue pain is referred to the ear through: \nSelect and explain. \nA. Hypoglossal nerve, B. Vagus nerve, C. Glossopharyngeal nerve, D. Lingual nerve', 'role': 'user'}, {'content': 'Answer: C \nExplanation: In carcinoma base of tongue pain is referred to the ipsilateral ear because of the common nerve supply of the base of tongue and ear i.e. Glossopharyngeal nerve. The anterior 2/3 of tongue is supplied by Lingual nerve Lingual nerve is a branch of mandibular N and auriculotemporal N which supplies ear is also a branch of mandibular N. Hence any pain of anterior 2/3 of tongue is referred to ear mandibular N. Any pain in the posterior 1/3 of tongue is referred to ear Glossopharyngeal and vagus N. Any pain in the base of tongue is referred to ear glossopharyngeal N.', 'role': 'assistant'}]