This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Physiology
In Plummer-Vinson syndrome, the region involved is 
Select and explain. 
A. Posterior pharyngeal wall, B. Valleculae, C. Postcricoid region, D. Pyriform sinus
B: Valleculae
Answer: B: Valleculae 
Explanation: Plummer-Vinson syndrome (PVS), a rare clinical condition, is characterized by a triad of dysphagia, iron deficiency anemia and esophageal web in the post-cricoid region. Ref ganong's review of medical physiology 25e 676