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: Surgery
[{'content': 'Sentinel lymph node biopsy is done in all except \nSelect and explain. \nA. ca breast, B. ca penis, C. malignant melanoma, D. ca colon', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]