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': 'Marker of Melanoma is - \nSelect and explain. \nA. S100, B. Ck 20, C. MTLF, D. Vimentin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: . S100', 'role': 'assistant'}]