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: Surgery
In breast conservation surgery, the healthy margin excised is typically: 
Select and explain. 
A. 1 cm, B. 2 cm, C. 3 cm, D. 5 cm
A: 1 cm
Answer: A: 1 cm 
Explanation: Breast Conservation Surgery. - Performed for early invasive breast cancer (Stage I, IIA, IIB) BCS consist of Excision of lump - Lumpectomy or Wide local excision with 1 cm margin or more extensive excision of a whole quadrant of breast (Quadrantectomy).