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
Cystosarcoma phylloides is treated by - 
Select and explain. 
A. Simple mastectomy, B. Radical mastectomy, C. Modified radical mastectomy, D. Antibiotic with conservative treatment
A: Simple mastectomy
Answer: A: Simple mastectomy 
Explanation: None