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
Pyriform fossa is situated in ? 
Select and explain. 
A. Oropharynx, B. Hypopharynx, C. Nasopharynx, D. None of the above
B: Hypopharynx
Answer: B: Hypopharynx 
Explanation: Ans. is 'b' i.e., Hypopharynx Pyriform fossa is a pa of laryngopharynx (hypopharynx)