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: Pathology
[{'content': 'Most common benign tumor of esophagus is - \nSelect and explain. \nA. Lipoma, B. Leiomyoma, C. Hamaoma, D. Hemengioma', 'role': 'user'}, {'content': 'Answer: B \nExplanation: . Leiomyoma', 'role': 'assistant'}]