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: ENT
Which is not a part of hypopharynx - 
Select and explain. 
A. Posterior cricoid region, B. Ary epiglottic folds, C. Posterior pharyngeal wall, D. Pyriform fossa
B: Ary epiglottic folds
Answer: B: Ary epiglottic folds 
Explanation: None