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
Most common site for nasopharyngeal carcinoma is 
Select and explain. 
A. Nasal septum, B. Fossa of rosenmuller, C. Vault of nasopharynx, D. Antero-superior wall
B: Fossa of rosenmuller
Answer: B: Fossa of rosenmuller 
Explanation: The commonest site of origin in the nasopharynx is the fossa of Rosenmuller. Anterior spread causes blockage of choana and nasal cavity and inferior spread are towards oropharynx and hypopharynx, lateral spread involves parapharyngeal space and infratemporal fossa through the sinus of Morgagni, an upward spread is towards intracranial structures. (Ref: Diseases of Ear, Nose and Throat, P.L Dhingra, 7th edition, page 284)