Bulging of an amber tympanic membrane without mobility is most often associated

D. middle ear effusion.

Explanation:

The tympanic membrane is a thin membrane present in the ear which transmits sound waves to the inner ear by vibrating itself like drum therefore also called the eardrum.

Sometimes a medical condition happens in which the tympanic membrane appears to be bulged or swelled. This eardrum swells due to the accumulation of the amber colored fluid which gets collected in the middle ear, which causes no pain, no redness and is immobile. This condition is known as the middle ear effusion.

Thus, Option-D is correct.

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