This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pathology
Sentinel lymph node biopsy is used for ? 
Select and explain. 
A. Melanoma, B. Basal cell carcinoma, C. Squamous cell carcionoma, D. Thyroid carcinoma
A: Melanoma
Answer: A: Melanoma 
Explanation: Ans. is 'a' i.e., Melanoma Sentinel lymph node biopsy is used for breast carcinoma and melanoma.