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: Surgery
[{'content': 'Commonest benign tumour of the esophagus \nSelect and explain. \nA. Leiomyoma, B. Papilloma, C. Adenoma, D. Hemangioma', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Benign tumours of the oesophagus are unusual and constitute less than 1% of all oesophagal neoplasms. Approximately 60% of benign oesophagal lesions are leiomyomas, 20% are cysts, 5% are polyps, and the remaining 5% are other neoplasms.Ref: Sabiston 2oth edition pg:1047', 'role': 'assistant'}]