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': 'Referred pain in the ear is commonly from ___ \nSelect and explain. \nA. Maxillary carcinoma, B. Nasopharyngeal carcinoma, C. Carcinoma tongue, D. Malignant otitis externa', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Referred causes of earache: As the ear receives nerve supply from: Vth (auriculotemporal branch) cranial nerve-dental, oral cavity, temporomandibular joint disorders and sphenopalatine neuralgia IXth (tympanic branch) cranial nerve -oropharynx, base of tongue, elongated styloid process Xth (auricular branch) cranial nerve-vallecula, epiglottis, larynx, esophagus From C2 (lesser occipital) and C2 and C3 (greater auricular), pain may be referred from these remote areas.', 'role': 'assistant'}]