This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pathology
[{'content': 'Otospongiosis causes \nSelect and explain. \nA. U/L conductive deafness only, B. B/L conductive deafness only, C. U/L sensorineural deafness only, D. B/L mixed conductive and sensorineural deafness', 'role': 'user'}, {'content': 'Answer: D \nExplanation: .', 'role': 'assistant'}]