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
Which of the following is MOST commonly associated with green discharge? 
Select and explain. 
A. Duct papilloma, B. Duct ectasia, C. Retention cyst, D. Fibroadenoma
B: Duct ectasia
Answer: B: Duct ectasia 
Explanation: A black or green discharge is usually due to duct ectasia and its complications. Ref: Bailey & Love 25/e, Page 831