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': 'What is the surgery of choice for diffuse type of choledochal cyst \nSelect and explain. \nA. Resection and repair, B. Rouxeny hepaticojejunostomy, C. Liver transplant, D. Observation', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Diffuse dilatation of the CBD is treated with resection and roux en y hepaticojejunostomy', 'role': 'assistant'}]