<prompt> What is the most common cause of deafness in a patient of Nasopharyngeal Carcinoma:Metastasis to Temporal BoneMiddle ear InfectionSerous otitis mediaInfiltration of Tumour middle ear  <response>: Nasopharyngeal carcinoma Due to obstruction of eustachian tube , there is serous otitis media and leads to hearing loss. MC site of origin - Fossa of Rosenmuller MC type - Squamous cell carcinoma MC Presentation - cervical lymphadenopathy Neck Mass 