A 58-year-old woman with a long history of iron deficiency anemia now presents with progressive dysphagia (difficulty swallowing), primarily with solid foods. On exam she has a swollen, painful,...

A 58-year-old woman with a long history of iron deficiency anemia now presents with progressive dysphagia (difficulty swallowing), primarily with solid foods. On exam she has a swollen, painful, smooth-appearing tongue (glossitis) and spooning of her nails (koilonychia). Endoscopy reveals she has a large esophageal web, which has been obstructing food passage. Her most likely diagnosis is:

A. Fanconi anemia

B. Lead poisoning

C. Esophageal cancer

D. Plummer-Vinson syndrome

E. Porphyria