This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Oral cavity & Oesophagus, Subject name: ENT
40 year old with koilonychia, iron deficiency and dysphagia, Diagnosis is 
Select and explain. 
A. Plummer Vinson syndrome, B. Achalasia cardia, C. ZES, D. None
A: Plummer Vinson syndrome
Answer: A: Plummer Vinson syndrome 
Explanation: Plummer Winson syndrome Classical Features: Dysphagia Iron Deficiency Anaemia Glossitis Angular Stomatitis Koilonychia Achlorhydria Atrophy of mucous membrane of the alimentary canal Predominantly affects females past 40 years Predisposes to development of carcinoma in - Tongue, Buccal mucosa, Pharynx, Esophagus, Stomach. (Ref: Textbook of diseases of ENT, PL Dhingra, 7th edition, pg no. 388)