This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: ENT
[{'content': 'Most common site for nasopharyngeal carcinoma: \nSelect and explain. \nA. Nasal septum, B. Fossa of rosenmuller, C. Vault of nasopharynx, D. Anterosuperior wall', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Nasopharyngeal carcinoma most commonly arises from fossa of rosenmuller in lateral wall of nasopharynx.', 'role': 'assistant'}]