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: Pathology
All of the following are invasive carcinoma of breast except -a) Comedo carcinomab) Colloid carcinomac) Lobular carcinoma in situd) Medullary carcinoma 
Select and explain. 
A. a, B. bc, C. ad, D. ac
D: ac
Answer: D: ac 
Explanation: Comedocarcinoma and lobular carcinoma in situ are in situ carcinomas ( not invasive carcinoma )