This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Unknown
Which si true regarding Torus tubaris? 
Select and explain. 
A. Nasopharyngeal bursitis, B. Most common site of carcinoma nasopharynx, C. Tubal elevation in lateral wall of nasopharynx, D. Gives rise to Rathke’s pouch
C: Tubal elevation in lateral wall of nasopharynx
Answer: C: Tubal elevation in lateral wall of nasopharynx 
Explanation: Ref. Diseases of Ear, Nose and Throat. Pg 239
 
Torus tubarius or cushion of the auditory canal is a mucosal elevation in the lateral aspect of the nasopharynx, formed by the underlying pharyngeal end of the cartilaginous portion of the Eustachian tube.

The opening of the Eustachian tube is anterior to the torus tobarius.
Immediately posterior to the torus tubarius is the fossa of Rosenmuller.  

From the inferior aspect of the torus tubarius, two mucosal folds extend inferiorly:

anterior fold: the salpingiopalatine fold, which overlies salpingopalatine muscle fibres
posterior fold: salpingopharyngeal fold, which overlies the salpingopharyngeus muscle

Anatomy Image