This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology and breast, Subject name: Surgery
[{'content': 'Sentinel lymph node is defined as \nSelect and explain. \nA. Primary LN draining tumor, B. LN which is first excised during MRM, C. LN nearest to tumor, D. None', 'role': 'user'}, {'content': "Answer: A \nExplanation: The first axillary lymphnode draining the breast (by direct drainage) is designated as sentinel lymph node. SLN is first node involved by tumour cells and presence or absence of its histological involvement when assesed will give a predictive idea about fuher spread of tunour to other nodes. SRB's Manual of Surgery.Edition -5. Pg no:543", 'role': 'assistant'}]