This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Oesophagus, Subject name: Surgery
[{'content': 'Dysphagia caused by in Plummer Vinson Syndrome is due to \nSelect and explain. \nA. Stenosis, B. Web, C. Stricture, D. Ulceration', 'role': 'user'}, {'content': 'Answer: B \nExplanation: (Web) (1024-25-LB) (737, 1043-B &L 25th)Plummer-Vinson Syndrome (Brown-Kelly Paterson syndrome or sideropenic dysphagia)* Young women with iron deficiency anaemia and dysphagia referred high in the neck.* The dysphagia was said to be caused by spasm or a web in the post-cricoid area. The patients were said to have an increased tendency to post-cricoid cancer.* Web certainly occurs in the upper oesophagus. More recently it has been noted that there is often a patch of heterotopic gastric mucosa in the upper oesophagus (probably congenital)* Complications - ulceration, stricture and adenocarcinoma', 'role': 'assistant'}]