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': 'True about choledochal cyst is - \nSelect and explain. \nA. Always extrahepatic T/t, B. T/t is cystojejunostomy, C. Excision is ideal t/t, D. Drainage is t/t of choice', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]