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 benign tumor of the esophagus? \nSelect and explain. \nA. Leiomyoma, B. Papilloma, C. Adenoma, D. Hemangioma', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans is a. i.e. Leiomyoma "Leiomyomas constitute more than 50% of benign esophageal tumors "-Schwaz', 'role': 'assistant'}]