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': 'Green discharge is most commonly seen with - \nSelect and explain. \nA. Duct papilloma, B. Duct ectasia, C. Retention cyst, D. Fibroadenosis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]