A 53-year-old man complains of attacks of vertigo associated with fullness in the ears and impaired hearing. This is worse on the right than on the left.These attacks can last hours and have been...

A 53-year-old man complains of attacks of vertigo associated with fullness in the ears and impaired hearing. This is worse on the right than on the left.These attacks can last hours and have been occurring on and off for several years. More recently, he has noticed trouble hearing between attacks too. What is the most likely explanation?

A. Excessive cerumen buildup; his ears need to be cleaned

B. Probable exposure to an aminoglycoside

C. Tumor in the cerebellopontine angle on the left

D. Too many rock concerts

E. Increased endolymph pressure and distended semicircular canals