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
A 51 yr female with ductal ca in situ of breast is best managed by: 
Select and explain. 
A. Breast conservative surgery, B. Simple mastectomy, C. Modified radical mastectomy, D. Radical mastectomy
B: Simple mastectomy
Answer: B: Simple mastectomy 
Explanation: None