This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gastrointestinal Radiology, Subject name: Radiology
[{'content': 'Large discrete ulcers in esophagus are seen in \nSelect and explain. \nA. Achalasia cardia, B. Plummer Vinson syndrome, C. Esophageal carcinoma, D. CMV esophagitis', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Oesophagitis including HIV and CMV oesophagitis usually manifest as one or more large ovoid or diamond-shaped ulcers.', 'role': 'assistant'}]