This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology and breast, Subject name: Surgery
[{'content': 'Nipple inversion occurs due to involvement of \nSelect and explain. \nA. Cooper ligament, B. Subareolar duct, C. Parenchyma of breast, D. Subdermal lymphatics', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Mastitis in many cases the lactiferous ducts will first become blocked by epithelial debris leading to stasis; this theory is suppoed by the relatively high incidence of mastitis in women with a retracted nipple.Periductal fibrosis is a sequela of periductal mastitis and may result in nipple retraction.Schwaz surgery 15th edition pg: 509', 'role': 'assistant'}]