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
Most common site for carcinoma pharynx in females suffering from plummer vinson syndrome is 
Select and explain. 
A. Post cricoid region, B. Posterior wall, C. Lateral wall, D. Pyriformis fossa
A: Post cricoid region
Answer: A: Post cricoid region 
Explanation: Ans. is 'a' i.e., Post cricoid Plummer-Vinson syndrome Plummer-Vinson syndrome, also known as Brown-Kelly-Paterson syndrome or sederopenic dysphagia, seen in middle aged edentulous women. The plummer Vinsion Paterson Brown Kelly Syndrome is characterized by : - Dysphagia Chronic iron deficiency anemia Atrophic oral mucosa and glossitis Brittle, spoon-shaped fingernails (Koilonychia) The cause of dysphagia is usually a cervical esophageal web, but abnormal pharyngeal and esophageal motility may play a role. The syndrome characterstically occurs in middle aged edentulous (without teeth) women. It is a premalignant lesion. Approximately 10% of patient develop squamous cell Ca of esophagus, oral cavity or the hypopharynx. As iron-deficiency anemia is a common finding, it is also known as sideropenic dysphagia. Carcinoma develops in post-cricoid region.