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: Radiology
[{'content': 'Diverticulum is seen in which type of choledocal Cyst \nSelect and explain. \nA. Type 1, B. Type 2, C. Type 3, D. Type 4', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Type-2\xa0 - An abnormal pouch or Sac (diverticulum) opening from main duct.', 'role': 'assistant'}]