A 52-year-old man presents with asymmetric sensorineural hearing loss and unilateral tinnitus. Immittance audiometry is performed, and the acoustic reflex decay test shows the pattern marked **B** in the diagram—reflex amplitude decays to less than 50% of its initial value within 5 seconds at 500 Hz and 1000 Hz. Which of the following is the most likely diagnosis that this finding is designed to screen for?
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