This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T., Subject name: Medicine
[{'content': "What is the most likely diagnosis for this finding detected during esophageal endoscopy? \nSelect and explain. \nA. Adenocarcinoma, B. Candidiasis, C. Dieulafoy's lesion, D. Schatzki ring", 'role': 'user'}, {'content': "Answer: A \nExplanation: Answer A. AdenocarcinomaThis nodular abnormality was found to be an early adenocarcinoma in a patient with Barrett's esophagus.", 'role': 'assistant'}]