(B) The $Eustachian$ $tube$ (also known as the pharyngotympanic tube) is a canal that connects the middle ear to the nasopharynx. Its primary function

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(B) The $Eustachian$ $tube$ (also known as the pharyngotympanic tube) is a canal that connects the middle ear to the nasopharynx. Its primary function is to equalize the air pressure on both sides of the tympanic membrane,which is essential for proper hearing and preventing damage to the ear.