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 type of mesentric cyst is \nSelect and explain. \nA. Enterogenous, B. Chylolymphatic, C. Dermoid, D. Urogenital remnant', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]