Which statement about the pharyngotympanic (Eustachian) tube is accurate?

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It drains into the oropharynxIt receives innervation from the glossopharyngeal nerve (cranial nerve IX)It is covered by stratified squamous epithelial cellsIts entire length is composed of cartilageIt is primarily involved in taste sensation

Explanation

The pharyngotympanic tube opens into the nasopharynx, not the oropharynx. It is innervated by the glossopharyngeal nerve (cranial nerve IX). The tube is lined mainly by respiratory epithelium rather than stratified squamous epithelium. Additionally, only part of the tube is cartilaginous, not its entire length.