This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Clinical Presentation and Physiology, Subject name: Surgery
Sentinel lymph node is defined as - 
Select and explain. 
A. Primary LN draining tumor, B. LN which is first excised during MRM, C. LN nearest to tumor, D. None
A: Primary LN draining tumor
Answer: A: Primary LN draining tumor 
Explanation: Ans. is 'a' i.e., Primary LN draining tumor