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
Otospongiosis causes - 
Select and explain. 
A. U/L conductive deafness, B. B/L conductive deafness, C. U/L sensorineural deafness, D. B/L sensorineural deafness
B: B/L conductive deafness
Answer: B: B/L conductive deafness 
Explanation: None