This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Breast, Subject name: Surgery
Nipple inversion occurs due to involvement of: 
Select and explain. 
A. Cooper's ligament, B. Subareolarm duct, C. Parenchyma of breast, D. Subdermal lymphatics
B: Subareolarm duct
Answer: B: Subareolarm duct 
Explanation: Ans. (b) Subareolar duct(Ref: Bailey 25/e p834)* Peau- de orange - Subdermal Lymphatic infiltration (T4b)* Dimpling/Puckering/tethering of skin - Due to Coopers ligament of breast involvement (It is not skin involvement is T staging)* Nipple retraction - Fibrosis in and around the Subareolar duct