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
[{'content': '"HMB 45" is a marker for: \nSelect and explain. \nA. Sarcoma, B. Melanoma, C. Carcinoma, D. None of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Melanoma', 'role': 'assistant'}]