A 35-year-old man presents with a 10-year history of chronic ear discharge that is scanty, foul-smelling, and occasionally blood-stained. Otoscopy reveals an attic perforation with white pearly debris and granulation tissue. Audiometry shows the pattern marked **B** in the diagram. CT temporal bone confirms erosion of the long process of incus and a labyrinthine fistula. Which of the following BEST explains the hearing loss pattern marked **B**?
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