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': 'Which is not visualised on posterior rhinoscopy- \nSelect and explain. \nA. Eustachian tube, B. Inferior meatus, C. Middle meatus, D. Superior concha', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]