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
[{'content': 'Most common site of nasopharyngeal carcinoma is- \nSelect and explain. \nA. Nasal septum, B. Fossa of Rosenmuller, C. Vault of nasopharynx, D. Anterosuperior wall', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Fossa of Rosenmuller o Repeat from previous sessions.", 'role': 'assistant'}]