In carcinoma base of tongue pain is referred to ear through

Ans. is 'c' i.e., Glossopharyngeal Referred otalgiao As ear receives nerve supply from Vth (auriculotemporal branch), IXth (tympanic branch) and IXth (auricular branch) cranial nerves; and from C2 (lesser occipital) and C2 and C3 (greater auricular), pain may be referred from these remote areas.Via IXth 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 neuralgiaVia IXth cranial nerveOropharynx : - Acute tonsillitis, peritonsillar abscess, tonsillectomy. Benign or malignant ulcers of soft palate, tonsil and its pillars.Base of tongue: - Tuberculosis or malignancyElongated styloid process.Via Xth cranial cerve : Malignancy or ulcerative lesion of vallecula, epiglottis, larynx or laryngopharynx, oesophagus.Via C2 and C3 spinal nerves : Cervical spondylosis, injuries of cervical spine, caries spine.