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 tumor of small intestine is - \nSelect and explain. \nA. Leiomyoma, B. Lymphoma, C. Adenocarcinoma, D. Hemangioma', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]