This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Head & Neck, Subject name: Anatomy
A 45-year-old woman visits the outpatient clinic with past history of dysphagia, nighttime fits of coughing, repeated chest infections, and a palpable swelling in her neck. Radiographic examination reveals the presence of a congenital pharyngeal pouch. Between which muscles is this pouch located? 
Select and explain. 
A. Between styloglossus and stylopharyngeus, B. Between palatoglossal arch and median glossoepiglottic fold, C. Between upper and middle pharyngeal constrictors, D. Between the cricopharyngeal and thyropharyngeal portions of inferior pharyngeal constrictor
D: Between the cricopharyngeal and thyropharyngeal portions of inferior pharyngeal constrictor
Answer: D: Between the cricopharyngeal and thyropharyngeal portions of inferior pharyngeal constrictor 
Explanation: The pharyngeal (Zenker) diverticulum is usually located between the cricopharyngeal and thyropharyngeal portions of the inferior pharyngeal constrictor. This is the most common site for development of a pharyngeal diverticulum due to the inherent weakness between the pharyngeal muscles in this location. Stasis of materials within this diverticulum can lead to inflammation, infection, and abscess. This site is also known as Killian's triangle.