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: Pathology
The type of breast carcinoma characterized by a pushing border 
Select and explain. 
A. Invasive ductal, B. Invasive lobular, C. Mucinous, D. Medullary
D: Medullary
Answer: D: Medullary 
Explanation: Medullary carcinoma is a rare subtype of carcinoma, accounting for less than 1% of breast cancers. These cancers consist of sheets of large anaplastic cells with well circumscribed, "pushing" borders Clinically, they can be mistaken for fibroadenomas ref : Robbins Basic Pathology, 9E,page-712