This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pharynx, Subject name: ENT
A patient presents with neck node and B type tympanogram. Diagnosis is 
Select and explain. 
A. Acoustic neuroma, B. Nasopharyngeal carcinoma, C. Angiofibroma, D. None
B: Nasopharyngeal carcinoma
Answer: B: Nasopharyngeal carcinoma 
Explanation: Due to the obstruction of the eustachian tube, there is a conductive hearing loss with serious or suppurative otitis media. Tinnitus and dizziness may occur. Presence of unilateral serous otitis media in an adult should raise suspicion of nasopharyngeal growth. A lump of nodes is found between the angle of the jaw and the mastoid and some nodes along with the spinal accessory in the posterior triangle of the neck. Nodal metastases are seen in 75% of the patients, (Ref: Diseases of Ear, Nose and Throat, PL Dhingra, 7th edition, page 284)