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: Pathology
Sentinel node biopsy for Ca breast is for 
Select and explain. 
A. Early diagnosis of cancer, B. For staging the tumours, C. Frozen section, D. Occult disease detection
B: For staging the tumours
Answer: B: For staging the tumours 
Explanation: *Sentinel lymph nodes: Lymph nodes where the lymphatics drain first from a primary tumorSentinel lymph node biopsy can be identified by radiotracer or colored dyes. If the sentinel node is negative for metastasis, it is unlikely that other more distant nodes will be involved and the patient can be spared the morbidity (like lymphedema) of complete axillary dissection.Ref: Robbins 8/e p1089