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': 'Threshold for bone conduction is normal and that for air conduction is increased in disease of: \nSelect and explain. \nA. Middle ear, B. Inner ear, C. Cochlear nerve, D. Temporal lobe', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Threshold for air conduction is increased (i.e. low frequency sounds are not heard well) whereas that of bone conduction in normal i.e. Bone conduction > air conduction which is seen in conductive deafness. Conductive deafness occurs in lesions of either external ear, tympanic membrane, middle ear or ossicles up to stapedio-vestibular joint.', 'role': 'assistant'}]