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: ENT
[{'content': 'The commonest benign intramural tumor of the esophagus is - \nSelect and explain. \nA. Fibroma, B. Leiomyoma, C. Angioma, D. Lipoma', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Leiomyoma is the most common benign neoplasma of esophagus and accounts for two-third of all the benign neoplasms.\nThey usually arise as intramural growth, most commonly along the distal two-third of the esophagus.', 'role': 'assistant'}]