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: Medicine
[{'content': 'Most common benign tumour of the oesophagus is: \nSelect and explain. \nA. Lipoma, B. Hamartoma, C. Leiomyoma, D. Hemangioma', 'role': 'user'}, {'content': 'Answer: C \nExplanation: BENIGN TUMORS OF ESOPHAGUS\n\nUsually mesenchymal in origin.\nArise within the esophageal wall.\n\nTypes of benign tumors:\n\nLeiomyomas - Most common.\nFibromas\nLipomas\nHemangiomas\nNeurofibromas\nLymphangiomas.', 'role': 'assistant'}]