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What is true about pharyngotympanic tube ( Eustachian tube) ?

/ General Anatomy Mcqs, Larynx, Medical Mcqs, Mouth, Pharynx / By
What is true about pharyngotympanic tube ( Eustachian tube) ?

A. It opens into oropharynx
B. Supplied by IX nerve
C. Lined stratified squamous epithelium
D. It is cartilaginous throughout its length