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': 'The posterosuperior retraction pocket, if allowed to progress, will lead to - \nSelect and explain. \nA. Sensorineural hearing loss, B. Secondary cholesteatoma, C. Tympanosclerosis, D. Tertiary cholesteatoma', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]