This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Head and neck, Subject name: Anatomy
Waldeyer&;s ring consists of all of the following except 
Select and explain. 
A. Palatine tonsils, B. Pharyngeal tonsils, C. Tubal tonsils, D. Post. auricular nodes
D: Post. auricular nodes
Answer: D: Post. auricular nodes 
Explanation: In relation to the Naso - oropharyngeal isthmus, there are several aggregations of lymphoid tissue that constitute waldeyer' s lymphatic ring. the most impoant aggregations are the right and left palatine tonsils usually referred to simply as the tonsils. posteriorly and above there is the nasopharyngeal tonsil; laterally and above there are the tubal tonsils, and inferiorly there is the lingual tonsil over the posterior pa of the dorsum of the tongue. Waldeyer's lymphatic ring Nasopharyngeal tonsil Tubal tonsil Intratonsillar cleft Palatine tonsil Lingual tonsil Ref BDC volume;3 Sixth edition