This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Surgery
[{'content': 'Commonest benigm tumour of the eosophagus? \nSelect and explain. \nA. Leiomyoma, B. Papilloma, C. Adenoma, D. Hemangioma', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e. Leiomyoma", 'role': 'assistant'}]