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: Surgery
Dysphagia in Plummer Vinson syndrome is due to 
Select and explain. 
A. Post cricoid region commonly involved in web formation, B. Web is common in lower region, C. It is due to abnormal vessels, D. Web is common in middle zone
A: Post cricoid region commonly involved in web formation
Answer: A: Post cricoid region commonly involved in web formation 
Explanation: Ans. is 'a' i.e. Post cricoid region commonly involved in web formation