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': "Rinne's test is negative in \nSelect and explain. \nA. Presbycusis, B. CSOM, C. Labyrinthitis, D. Meniere's disease", 'role': 'user'}, {'content': 'Answer: B \nExplanation: A negative Rinne test is seen in conductive deafness - when bone conduction is greater than air conduction. Chronic suppurative otitis media is a disease of the middle ear and hence causes conductive deafness. (Ref: Diseases of EAR, NOSE AND THROAT by PL DHINGRA - 6th Edition. Page no. 22)', 'role': 'assistant'}]