This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ear, 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: B \nExplanation: The option (b) should have been primary cholesteatoma and not secondary.Secondary cholesteatoma occurs due to migration of squamous epithelium through a preexisting perforation such as poslerosuperior marginal or total perforation (as occurs after acute necrotising otitis media). There is no term like tertiary cholesteatoma as given in option (d).', 'role': 'assistant'}]