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Which of the following structures are tubes?

A. Eustachian, Pharynx, Bronchi
B. Cilia, Adenoids, Mucous, Epiglottis
C. Apex, Maxillary, Sphenoidal, Ethmoidal

Answer :

The correct answer among the choices given is option A. Eustachian, Pharynx, Bronchi are structures that ensembles a tube. The Eustachian tube is a narrow passage from the pharynx to the middle ear. Pharynx is a passageway leading from the oral and nasal cavities to the larynx and the esophagus. Lastly, bronchi is an airway in the respiratory tract.

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