This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous Ear, Subject name: ENT
Referred otalgia can be due to? 
Select and explain. 
A. Carcinoma larynx, B. Carcinoma oral cavity, C. Carcinoma tongue, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: ANSWER: (D) All of the aboveREF: Dhingra 4th ed p. 124Causes of referred otalgiaEar receives nerve supply from Vth (auriculotemporal), IXth (tympanic br.) and Xth (auricular br.) cranial nerves; and from C2 (lesser occipital) and C2 and C3 (greater auricular), pain may be referred from these remote areasVia Vth cranial nerveDental; Caries tooth, apical abscess, impacted molar, malocclusion.Oral cavity; Benign or malignant ulcerative lesions of oral cavity or tongue.Temporomandibular joint disorders; Bruxism, osteoarthritis, recurrent dislocation, ill- fitting denture.Sphenopalatine neuralgia.Via IXth cranial nerveOropharynx; Acute tonsillitis, peritonsillar abscess, tonsillectomy. Benign or malignant ulcers of soft palate, tonsil and its pillars.Base of tongue; Tuberculosis or malignancy.Elongated styloid process.Via Xth cranial nerve. Malignancy or ulcerative lesion of: vallecula, epiglottis, larynx or laryngopharynx, esophagus.Via C2 and C3 spinal nerves. Cervical spondylitis, injuries of cervical spine, caries spine.