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: Gynaecology & Obstetrics
[{'content': 'Sentinel biopsy is MOST useful in? \nSelect and explain. \nA. Cervix carcinoma, B. Vulval carcinoma, C. Vaginal carcinoma, D. Endometrial Carcinoma', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Sentinel node is a lymph node that is first to receive drainage from a malignancy. Sentinel lymph node biopsy is used in breast carcinoma, melanoma, vulval carcinoma. Ref: Novak, 14th edition, page; 1425-1426', 'role': 'assistant'}]