**Question:** Sentinel lymph node biopsy in carcinoma breast is done if:

A. The tumor is >5 cm in size
B. The tumor is 2 cm in size
D. The tumor is <2 cm in size **Core Concept:** Sentinel lymph node biopsy (SLNB) is a minimally invasive procedure used to determine if cancer has spread to lymph nodes in the armpit. In carcinoma breast, SLNB is performed to assess the risk of cancer spreading to other lymph nodes and guide the choice of further treatment, including axillary lymph node dissection and systemic therapies. **Why the Correct Answer is Right:** The correct answer is D. The tumor is 5 cm in size (incorrect): Sentinel lymph node biopsy is less common in larger tumors as the risk of lymph node involvement increases. In such cases, more extensive axillary lymph node dissection may be required, and SLNB is not as crucial.

B. The tumor is 2 cm in size (incorrect): As explained above, SLNB is less crucial in tumors larger than 2 cm, but it may still provide crucial information for individualized treatment planning.

**Correct Answer Explanation:**
The correct answer (option D) is 5 cm in size (incorrect): SLNB becomes less important in larger tumors due to the higher risk of lymph node involvement, which can be assessed through more extensive axillary lymph node dissection or other diagnostic